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Glossary of Chemistry Terms
beginning with letter S
Browse the Chemistry Glossary
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SA Tweet Definition of SA Like Definition of SA on Facebook
initialism 
  1. Sturmabteilung
  1. South Africa
    1. (medicine) sino-auricular
    2. small arms
  2. South America
    1. South Australia/South Australian
  3. (in gay personal ads) straight-acting
  4. abbreviation for Stage Accompany (SA)
     
saccharide Tweet Definition of saccharide Like Definition of saccharide on Facebook
noun 
  1. (carbohydrate) The unit structure of carbohydrates, of general formula CnH2nOn. Either the simple sugars or polymers such as starch and cellulose. The saccharides exist in either a ring or short chain conformation, and typically contain five or six carbon atoms.
     
saccharimeter Tweet Definition of saccharimeter Like Definition of saccharimeter on Facebook
noun 
  1. A polarimeter used to measure the sugar content of a liquid
     
saccharometer Tweet Definition of saccharometer Like Definition of saccharometer on Facebook
noun 
  1. A hydrometer used to measure the sugar content of a liquid
     
sal ammoniac Tweet Definition of sal ammoniac Like Definition of sal ammoniac on Facebook
noun 
  1. (alchemy) a rare mineral composed of ammonium chloride found around volcanic fumaroles and guano deposits.
  2. (context, chemistry, archaic) ammonium chloride.
     
salicylate Tweet Definition of salicylate Like Definition of salicylate on Facebook
noun 
  1. (chemistry) any salt or ester of salicylic acid
     
salimeter Tweet Definition of salimeter Like Definition of salimeter on Facebook
noun 
  1. A hydrometer used to measure the concentration of salt in a solution
     
saline Tweet Definition of saline Like Definition of saline on Facebook
noun 
  1. water, Water containing dissolved salt.
adjective 
  1. (notcomparable) contain, Containing salt.
     
salinometer Tweet Definition of salinometer Like Definition of salinometer on Facebook
noun 
  1. a salimeter
     
salometer Tweet Definition of salometer Like Definition of salometer on Facebook
noun 
  1. a salimeter
     
salt Tweet Definition of salt Like Definition of salt on Facebook
noun 
  1. A common substance recognised chemically as sodium chloride (NaCl?), used extensively as a condiment and preservative.
  2. (chemistry) One of the compounds formed from the reaction of an acid with a base, where a positive ion replaces a hydrogen of the acid.
  3. A kind of marsh at the shore of a sea (short for salt marsh, apparently not in a wide-spread use).
  4. (slang) A sailor (also old salt).
  5. (cryptography) Additional bytes inserted into a plaintext message before encryption, in order to increase randomness and render brute force, brute-force decryption more difficult.
verb 
  1. (transitive) To add salt to.
  2. (mining) To blast gold into (as a portion of a mine) in order to cause to appear to be a productive seam.
  3. (cryptography) To add filler bytes before encrypting, in order to make brute-force decryption more resource-intensive.
  4. To include colorful language in.
  5. To insert or inject something into an object to give it properties it would not naturally have.
adjective 
  1. salty, Salty.
  2. saline, Saline.
     
salting out Tweet Definition of salting out Like Definition of salting out on Facebook
noun 
  1. a technique for the separation of proteins by differential precipitation in a solution of sodium chloride or ammonium sulphate
     
saltpeter Tweet Definition of saltpeter Like Definition of saltpeter on Facebook
noun 
  1. US spelling of saltpetre.
     
saponify Tweet Definition of saponify Like Definition of saponify on Facebook
verb (saponifies, saponifying, saponified) (transitive and intransitive)
  1. to convert a fat or oil into soap; to be converted into soap
  1. (chemistry) to hydrolyze an ester using an alkali
     
saran Tweet Definition of saran Like Definition of saran on Facebook
noun 
  1. A plastic resin used to make packaging films.
     
saturate Tweet Definition of saturate Like Definition of saturate on Facebook
verb (saturat, ing)
  1. To cause to become completely penetrated, impregnated, or soaked; imbue.
After walking home in the driving rain, his clothes were saturated.
  1. To satisfy the affinity of; to cause a substance to become inert by chemical combination with all that it can hold.
One can phosphorus with chlorine.
     
SC Tweet Definition of SC Like Definition of SC on Facebook
abbreviation 
  1. South Carolina, a state of the United States of America.
  2. Superior Court.
  3. Supreme Court.
  4. StarCraft?, a strategy PC game.
  5. Status conference.
  6. Settlement Conference.
  7. Small claims.
  8. State College, as used with proper names.
  9. Senior Counsel
  10. Security Council of the United Nations
     
scandium Tweet Definition of scandium Like Definition of scandium on Facebook
noun (Symbol: Sc)
  1. a metallic chemical element, atomic number 21, obtained from some uranium ores; it is a transition element.
     
scavenger Tweet Definition of scavenger Like Definition of scavenger on Facebook
noun 
  1. (obsolete) A street sweeper.
    1. Someone who scavenges, especially one who searches through rubbish for food or useful things.
    2. An animal that feeds on decaying matter such as carrion.
  2. (chemistry) A substance used to remove impurities from the air or from a solution.
     
scission Tweet Definition of scission Like Definition of scission on Facebook
noun 
  1. the act of division, separation, cutting or sever, severing
  2. cleavage
     
scrub Tweet Definition of scrub Like Definition of scrub on Facebook
noun 
  1. One who labors hard and lives meanly; a mean fellow.
We should go there in as proper a manner possible; nor altogether like the scrubs about us.
  1. Something small and mean.
  2. A worn-out brush.
  3. A thicket or jungle, often specified by the name of the prevailing plant; as, oak scrub, palmetto scrub, etc.
  4. (Stock Breeding): One of the common livestock of a region of no particular breed or not of pure breed, esp. when inferior in size, etc. Often used to refer to male animals unsuited for breeding.
  5. Vegetation of inferior quality, though sometimes thick and impenetrable, growing in poor soil or in sand; also, brush. See brush, above.
  6. (Gaming): One who is no longer new to a game but still exhibits novice tendencies. "What a scrub."
verb (scrub, b, ing)
  1. (transitive) To rub hard; to wash with rubbing; usually, to rub with a wet brush, or with something coarse or rough, for the purpose of cleaning or brightening; as, to scrub a floor, a doorplate.
  2. (intransitive) To rub anything hard, especially with a wet brush; to scour; hence, to be diligent and penurious; as, to scrub hard for a living.
  3. (transitive) To call off a scheduled event; to cancel.
Engineers had to the satellite launch due to bad weather.
adjective 
  1. Mean; dirty; contemptible; scrubby.
"How solitary, how scrub, does this town look!" -Walpole.
"No little joint shall come on my board." -Swift.
     
SE Tweet Definition of SE Like Definition of SE on Facebook
abbreviation 
  1. southeast
initialism 
  1. Second Edition
  2. Special Edition
     
sealant Tweet Definition of sealant Like Definition of sealant on Facebook
noun 
  1. Any material used to seal a surface so as to prevent passage of a fluid.
     
sebacic acid Tweet Definition of sebacic acid Like Definition of sebacic acid on Facebook
noun 
  1. (chemistry) an aliphatic dicarboxylic acid, (CH2)8(COOH)2, originally prepared from tallow; it is used in the manufacture of resins, plasticizers and polyester rubbers
     
selenate Tweet Definition of selenate Like Definition of selenate on Facebook
noun 
  1. (chemistry) any salt or ester of selenic acid
     
selenic Tweet Definition of selenic Like Definition of selenic on Facebook
adjective 
  1. (chemistry) of, or containing selenium
     
selenic acid Tweet Definition of selenic acid Like Definition of selenic acid on Facebook
noun 
  1. (chemistry) a solid white acid, H2SeO?4, having the same structure and similar reactions as sulphuric acid
     
selenide Tweet Definition of selenide Like Definition of selenide on Facebook
noun 
  1. (chemistry) any compound in which selenium serves as an anion with an oxidation number of -2
  2. (chemistry) any organic compound of general formula RSeR? (R not = H) analogous to the ethers
     
selenite Tweet Definition of selenite Like Definition of selenite on Facebook
noun 
  1. (mineralogy) a soft, glassy form of gypsum (chemical formula CaSO?4·2H2O)
  2. (chemistry) the anion SeO?32− derived from selenous acid; any salt or ester of senenous acid
     
semiquinone Tweet Definition of semiquinone Like Definition of semiquinone on Facebook
noun 
  1. (chemistry) an intermediate free radical generated in the conversion of quinones to/from hydroquinones
     
series Tweet Definition of series Like Definition of series on Facebook
noun (series)
  1. A number of things that follow on one after the other or are connected one after the other.
  2. A television or radio program which consists of several episodes that are broadcast in regular intervals
Friends was one of the most successful television series in recent years.
  1. (analysis) The sum of the terms of a sequence.
  2. (cricket) A group of matches between two sides; the aim being to win more matches than the opposition
     
sesquioxide Tweet Definition of sesquioxide Like Definition of sesquioxide on Facebook
noun 
  1. (chemistry) Any oxide containing three oxygen atoms for every two metal atoms
     
sesquiterpene Tweet Definition of sesquiterpene Like Definition of sesquiterpene on Facebook
noun 
  1. (chemistry) any terpene formed from three isoprene units, and having fifteen carbon atoms; includes several plant pigments such as the flavones
     
Set Tweet Definition of Set Like Definition of Set on Facebook
proper noun (also Seth)
  1. An ancient Egyptian god, variously described as the god of chaos, the god of thunder and storms, or the god of destruction.
     
SI Tweet Definition of SI Like Definition of SI on Facebook
initialism 
  1. Smithsonian Institution
     
side chain Tweet Definition of side chain Like Definition of side chain on Facebook
noun (or side-chain)
  1. (chemistry) in organic chemistry, that part of a molecule attached to some core structure; a radical
  2. (biochemistry) the variable parts of amino acids that extend from the peptide backbone in proteins; they are referred to as R-groups, which branch off the backbone at the alpha carbon (Cα).
     
Sienna Tweet Definition of Sienna Like Definition of Sienna on Facebook
proper noun 
  1. (given name, female) of modern usage from the sienna colour.
     
silane Tweet Definition of silane Like Definition of silane on Facebook
noun 
  1. (chemistry) Any of a group of silicon hydrides that are analogous to the paraffin hydrocarbons; especially the parent compound SiH?4
     
silica Tweet Definition of silica Like Definition of silica on Facebook
noun 
  1. silicon dioxide.
  2. any of the silica group of the silicate minerals.
     
silica gel Tweet Definition of silica gel Like Definition of silica gel on Facebook
noun silica gel
  1. a granular, porous form of silica made synthetically from sodium silicate and used as a desiccant.
     
silicate Tweet Definition of silicate Like Definition of silicate on Facebook
noun 
  1. (chemistry) Any salt of silica or of one of the silicic acids; any mineral composed of silicates
     
silicic Tweet Definition of silicic Like Definition of silicic on Facebook
adjective 
  1. of, related to, or derived from silica
     
silicic acid Tweet Definition of silicic acid Like Definition of silicic acid on Facebook
noun 
  1. (chemistry) any of a range of compounds, being hydrates of silica
    • metasilicic acid H2SiO?3
    • orthosilicic acid H4SiO?4
    • disilicic acid H2Si2O5
    • pyrosilicic acid H6Si2O7
      They form silicates having complex polymeric structures
     
silicium Tweet Definition of silicium Like Definition of silicium on Facebook
noun 
  1. (obsolete),(chemistry) silicon
     
silicon Tweet Definition of silicon Like Definition of silicon on Facebook
noun 
  1. (chemistry) A nonmetallic element (symbol Si) with an atomic number of 14 and atomic weight of 28.0855.
     
silicon carbide Tweet Definition of silicon carbide Like Definition of silicon carbide on Facebook
noun 
  1. (chemistry) a binary compound of silicon and carbon, SiC?; it is one of the hardest known materials, and is used as an abrasive, under the trade name Carborundum, and as a refractory material
     
silicon dioxide Tweet Definition of silicon dioxide Like Definition of silicon dioxide on Facebook
noun 
  1. (chemistry) a hard glassy mineral, SiO?2, occurring as quartz, sand, opal etc. Informally known as silica.
     
silicone Tweet Definition of silicone Like Definition of silicone on Facebook
noun 
  1. (chemistry) a class of inert, semi-inorganic chemistry, inorganic polymeric compounds of silicon, having a wide range of thermal stability and extreme water repellence, used in a very wide range of industrial applications, and in prosthetic replacements for body parts
     
silicone rubber Tweet Definition of silicone rubber Like Definition of silicone rubber on Facebook
noun 
  1. A variety of synthetic polymeric silicones having physical properties similar to natural rubber but increased chemical stability
     
silicon tetrachloride Tweet Definition of silicon tetrachloride Like Definition of silicon tetrachloride on Facebook
noun 
  1. the binary compound of silicon and chlorine SiCl?4
     
silicon tetrafluoride Tweet Definition of silicon tetrafluoride Like Definition of silicon tetrafluoride on Facebook
noun 
  1. the binary compound of silicon and fluorine SiF?4, a colourless, poisonous gas with a pungent odour, used in the production of silicon semiconductors
     
siloxane Tweet Definition of siloxane Like Definition of siloxane on Facebook
noun 
  1. (chemistry) any of a class of inorganic compound having a short repeating unit of silicon and oxygen atoms with organic side chains
     
silver Tweet Definition of silver Like Definition of silver on Facebook
noun 
  1. (uncountable) A lustrous, white, metallic element, atomic number 47, atomic weight 107.87, symbol Ag.
  2. (collectively) Coins made from silver or any similar white metal.
  3. (collectively) Cutlery, whether silver or made from some other white metal (U.S.: silverware).
  4. (collectively) Any items made from silver or any other white metal.
  5. (countable) A shiny gray/grey color/colour.
<table><tr><td>silver colour: &nbsp;</td><td bgcolor="
  1. C0C0C0?" width="80">&nbsp; </td></tr></table>
adjective 
  1. Made from silver.
  2. Made from another white metal.
  3. Having a color/colour like silver: a shiny gray/grey.
     
single bond Tweet Definition of single bond Like Definition of single bond on Facebook
noun 
  1. (chemistry) a covalent bond in which one electron pair is shared between two atoms
     
slake Tweet Definition of slake Like Definition of slake on Facebook
verb (slak, ing)
  1. To go out; to become extinct.
  2. To abate; to become less decided.
  3. To slacken; to become relaxed.
  4. To become mixed with water, so that a true chemical combination takes place; as, the lime slakes.
  5. To dash water on a hot surface to cool it.
    • Notes for landscape tones. Long sequences of tempera. Light filtered through the essence of lemons. An air full of brick-dust - sweet smelling brick dust and the odour of hot pavements slaked with water. Lawrence Durrell. Justine. Faber & Faber 1961 p.14
     
slaked lime Tweet Definition of slaked lime Like Definition of slaked lime on Facebook
noun 
  1. calcium hydroxide, a soft white powder, produced by adding water to quicklime. It is used in making mortar and cement, and has many industrial uses.
     
slurry Tweet Definition of slurry Like Definition of slurry on Facebook
noun (uncountable) Pronunciation
  • (IPA, RP: /Ë�slÊ�ri/)
  • :Rhymes: Rhymes:English:-Ê�ri, -Ê�ri
    1. A thin mixture of liquid and fine substances such as clay or plaster of Paris.
    2. Liquid waste produced by mountain top removal mining. Usually very toxic. Usually stored nearby in giant dams.
adjective (slurrier, slurriest) Pronunication:
  • (IPA, RP: /Ë�slÉ�Ë�ri/)
  • :Rhymes: Rhymes:English:-É�Ë�ri, -É�Ë�ri
    1. Slurred, tending to slur.
    slurry voice
     
smoke Tweet Definition of smoke Like Definition of smoke on Facebook
noun 
  1. (uncountable) Very fine particles and vapor/vapour given off by burning material.
  2. (Military) A particulate of solid or liquid particles dispersed into the air on the battlefield to degrade enemy ground and aerial observation. Smoke has many uses--screening smoke, signaling smoke, smoke curtain, smoke haze, and smoke deception. Thus it is an artificial aerosol.
  3. An instance of smoking a cigarette, cigar, etc.
  • I'm going out for a .
    1. (slang) (countable) A cigarette.
    2. A light grey colour/color tinted with blue.
<table><tr><td>smoke colour: &nbsp;</td><td bgcolor="
  1. D6E2E2?" width="80">&nbsp; </td></tr></table>
    1. (slang) The Smoke: London
verb (smok, ing)
  1. (intransitive) To deliberately inhale smoke, especially from cigarettes.
  • Do you ?
    1. (transitive) To deliberately inhale the smoke from for example a cigarette, cigar, or pipe.
  • He's smoking his pipe.
    1. (transitive) To preserve by treating with smoke.
  • We can buy some smoked salmon for the occasion.
    1. (intransitive) To give off smoke.
    • adjective 
    1. Of the colour known as smoke.
         
    Sn Tweet Definition of Sn Like Definition of Sn on Facebook
    abbreviation 
    1. Sunday
         
    soda Tweet Definition of soda Like Definition of soda on Facebook
    noun 
    1. (uncountable) sodium carbonate, Sodium carbonate.
    2. (uncountable) Sodium in chemical combination.
    3. (uncountable) Carbonated water (originally made with sodium bicarbonate).
    4. (context, US, uncountable) Any carbonated (usually sweet) soft drink.
    5. (context, US, countable) A glass, bottle or can of this drink.
         
    soda ash Tweet Definition of soda ash Like Definition of soda ash on Facebook
    noun 
    1. industrial-grade sodium carbonate
         
    sodamide Tweet Definition of sodamide Like Definition of sodamide on Facebook
    noun 
    1. (dated),(chemistry) sodium amide
         
    sodium Tweet Definition of sodium Like Definition of sodium on Facebook
    noun 
    1. A soft, waxy, silvery reactive metal that is never found unbound in nature, and a chemical element (symbol Na) with an atomic number of 11 and atomic weight of 22.989770.
         
    sodium amide Tweet Definition of sodium amide Like Definition of sodium amide on Facebook
    noun 
    1. (chemistry) a white solid, NaNH?2 obtained by reacting ammonia with metallic sodium; it is used in the production of hydrazine, and indigo dyes
         
    sodium carbonate Tweet Definition of sodium carbonate Like Definition of sodium carbonate on Facebook
    noun 
    1. (chemistry) A salt, Na2CO3 formally derived from sodium hydroxide and carbonic acid; it is a white powder, soluble in water, with domestic, commercial and industrial uses
         
    sodium chloride Tweet Definition of sodium chloride Like Definition of sodium chloride on Facebook
    noun 
    1. Chemical term for common table salt, a compound composed of equal number of sodium and chlorine atoms. Chemical formula NaCl?.
         
    sodium hydroxide Tweet Definition of sodium hydroxide Like Definition of sodium hydroxide on Facebook
    noun 
    1. (chemistry) a strong, caustic alkali, NaOH?, used in the manufacture of soap, detergents, paper, textiles and having many other industrial applications
         
    sodium sulfite Tweet Definition of sodium sulfite Like Definition of sodium sulfite on Facebook
    noun 
    1. (chemistry) the sodium salt of sulfurous acid, Na2SO3, used as a food preservative, in photography and in many industrial applications
         
    sodium tetraborate Tweet Definition of sodium tetraborate Like Definition of sodium tetraborate on Facebook
    noun sodium tetra-, tetraborate
    1. borax
         
    soft Tweet Definition of soft Like Definition of soft on Facebook
    adjective ((compar): softer, (superl): softest)
    1. Giving way under pressure.
    My head sank easily into the soft pillow.
    1. (context, of cloth or similar material) Smooth and flexible.
    Polish the silver with a soft cloth to avoid scratching.
    1. Gentle.
    There was a soft breeze blowing.
    1. (context, of a sound) Quiet.
    I could hear the soft rustle of the leaves in the trees.''
    1. (linguistics) voiced, sonant
    DH represents the voiced (soft) th of English these clothes. " w:The Lords of the Rings, The Lord of the Rings, w:J.R.R. Tolkien, J.R.R. Tolkien
    1. (linguistics) (rare) voiceless
    2. (linguistics) palatalized
    3. Lacking strength or resolve.
    When it comes to drinking, Wessel is as soft as they come.
    1. (context, of water) Low in dissolved calcium compounds.
    You won't need as much soap, as the water here is very soft.
    1. (Northern British, colloquial) Foolish.
         
    solidus Tweet Definition of solidus Like Definition of solidus on Facebook
    noun (solidi)
    1. The line between the numerator and the denominator of a fraction.
    2. A forward slash or virgule.
    3. A late Roman gold coin (after 3rd Century CE); a bezant.
    4. (context, chemistry, physics) a line, in a phase diagram, below which a given substance is a stable solid.
         
    solubility Tweet Definition of solubility Like Definition of solubility on Facebook
    noun (wikipedia, Solubility, Solubility (chemisty))
    1. the condition of being soluble
    2. (chemistry) the amount of a substance that will dissolve in a given amount of a solvent, to give a saturated solution, under specified conditions
         
    solubilize Tweet Definition of solubilize Like Definition of solubilize on Facebook
    verb (solubiliz, ing)
    1. (transitive) to make something soluble or dispersible, especially by adding a detergent
         
    soluble Tweet Definition of soluble Like Definition of soluble on Facebook
    adjective 
    1. able, Able to be dissolved.
      • Sugar is in water.
      • Able to be solved or explained.
      • A mystery that is easily .
         
    solute Tweet Definition of solute Like Definition of solute on Facebook
    noun 
    1. Any substance that is dissolved in a liquid solvent to create a solution
    adjective 
    1. Loose; free; liberal
      a interpretation
         
    solvent Tweet Definition of solvent Like Definition of solvent on Facebook
    noun (wikipedia, Solvent, Solvent (chemistry))
    1. A liquid that dissolves a solid, liquid, or gaseous solute, resulting in a solution.
    adjective 
    1. Able to pay all debts.
         
    solvolysis Tweet Definition of solvolysis Like Definition of solvolysis on Facebook
    noun 
    1. (chemistry) any reaction, between a solute and its solvent, in which one or more bonds of the solute are broken; specifically a substitution, elimination or fragmentation reaction in which the solvent is the nucleophile
         
    soot Tweet Definition of soot Like Definition of soot on Facebook
    noun 
    1. Fine black or dull brown particles of amorphous carbon and tar, produced by the incomplete combustion of coal, oil etc.
         
    sorbate Tweet Definition of sorbate Like Definition of sorbate on Facebook
    noun 
    1. (chemistry) any salt or ester of sorbic acid
         
    sorbic acid Tweet Definition of sorbic acid Like Definition of sorbic acid on Facebook
    noun 
    1. (chemistry) an unsaturated aliphatic carboxylic acid, CH3.CH:CH.CH:CH.COOH, found in Rowan berries, and used as a preservative
         
    sour Tweet Definition of sour Like Definition of sour on Facebook
    noun 
    1. the sensation of a sour taste
    2. a drink made with whiskey, lemon or lime juice and sugar
    verb to sour
    1. to make or become sour or disenchanted
    adjective 
    1. having an acid, sharp or tangy taste
    2. made rancid by fermentation etc
    3. tasting or smelling rancid
    4. peevish or bad-tempered
    5. (context, of soil) excessively acid and thus infertile
    6. (context, of petroleum) containing excess sulphur
         
    spandex Tweet Definition of spandex Like Definition of spandex on Facebook
    noun 
    1. a synthetic fibre known for its exceptional elasticity
         
    Spirit Tweet Definition of Spirit Like Definition of Spirit on Facebook
    proper noun 
    1. (Holy) : in Christian theology, the Third Person of the Blessed Trinity, the three aspects of God
    2. The name given to a Mars exploration rover launched June 10, 2003. See w:MER-A, wikipedia entry
         
    SR Tweet Definition of SR Like Definition of SR on Facebook
    initialism 
    1. state road/state route
         
    stability Tweet Definition of stability Like Definition of stability on Facebook
    noun (stabilities, -)
    1. The condition of being stable.
    2. The tendency to recover from perturbations.
         
    stable Tweet Definition of stable Like Definition of stable on Facebook
    noun 
    1. A building, wing or dependency set apart and adapted for lodging and feeding (and training) animals with hoofs, especially horses
    2. (metonymy) all the racehorses of a particular stable, i.e. belonging to a given owner.
    adjective 
    1. Relatively unchanging, permanent; firmly fixed or established, not easily to be moved, changed, unbalanced, destroyed or altered in value.
    He was in a stable relationship.      
    stannate Tweet Definition of stannate Like Definition of stannate on Facebook
    noun 
    1. (chemistry) Any salt of stannic acid.
         
    stannic Tweet Definition of stannic Like Definition of stannic on Facebook
    adjective 
    1. (chemistry) Containing tetravalent tin.
         
    stannous Tweet Definition of stannous Like Definition of stannous on Facebook
    adjective 
    1. (chemistry) Containing bivalent tin.
         
    stannum Tweet Definition of stannum Like Definition of stannum on Facebook
    noun (uncountable)
    1. (chemistry) (rare) tin
         
    stearate Tweet Definition of stearate Like Definition of stearate on Facebook
    noun 
    1. (fatty acid) Any salt or ester of stearic acid.
         
    stereochemistry Tweet Definition of stereochemistry Like Definition of stereochemistry on Facebook
    noun 
    1. (chemistry) the branch of chemistry that involves the spatial arrangement of the atoms of molecules, and studies how this affects the physical and chemical properties of such species
         
    stereoisomer Tweet Definition of stereoisomer Like Definition of stereoisomer on Facebook
    noun 
    1. (chemistry) one of a set of the isomers of a compound that exhibits stereoisomerism
         
    stereoisomeric Tweet Definition of stereoisomeric Like Definition of stereoisomeric on Facebook
    adjective 
    1. of or pertaining to stereoisomers or stereoisomerism
         
    stereoisomerism Tweet Definition of stereoisomerism Like Definition of stereoisomerism on Facebook
    noun 
    1. (chemistry) a form or isomerism in which atoms are arranged differently about a chiral centre (or centre of asymmetry); they exhibit optical activity; in a molecule with a single chiral centre the two isomers (enantiomers) are mirror images of each other; in a molecule with multiple chiral centres the isomers (diastereoisomers) are not normally mirror images
         
    stereospecific Tweet Definition of stereospecific Like Definition of stereospecific on Facebook
    adjective 
    1. showing stereospecificity
         
    steric Tweet Definition of steric Like Definition of steric on Facebook
    adjective 
    1. (chemistry) Relating to or involving the arrangement of atoms in space.
      1. of the repulsion of atoms due to closeness or arrangement
         
    stibine Tweet Definition of stibine Like Definition of stibine on Facebook
    noun 
    1. antimony hydride, SbH?3; a poisonous gas, sometims used as a fumigant
         
    stibium Tweet Definition of stibium Like Definition of stibium on Facebook
    noun 
    1. antimony sulphide/antimony sulfide used in ancient Rome in makeup.
         
    stilbene Tweet Definition of stilbene Like Definition of stilbene on Facebook
    noun 
    1. (chemistry) Either of two isomeric hydrocarbons, diphenylethylene, but especially the trans isomer, used in the manufacture of dyes and many other compounds
         
    stoichiometric Tweet Definition of stoichiometric Like Definition of stoichiometric on Facebook
    adjective 
    1. of, or relating to stoichiometry
    1. (chemistry) (of reactants, or of elements in a compound) existing in a ratio of small integers
         
    stoichiometry Tweet Definition of stoichiometry Like Definition of stoichiometry on Facebook
    noun 
    1. (chemistry) The study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).
         
    strip Tweet Definition of strip Like Definition of strip on Facebook
    noun 
    1. a long, thin piece of a bigger item
      • You use strips of paper in papier mache.
        1. a series of drawings, a comic
        2. a landing strip
        3. a street with multiple shopping or entertainment possibilities
        4. (fencing) The fencing area, roughly 14 meters by 2 meters.
        5. (UK football) the uniform of a football team, or the same worn by supporters.
    verb (strip, p, ing)
    1. (transitive) To remove or take away.
      • Norm will the old varnish before painting the chair.
        1. (transitive) To take off clothing.
        2. (intransitive) To do a striptease.
        3. (transitive) To completely take away, to plunder.
      • The robbers stripped Norm of everything he owned.
        1. (transitive) To remove the threads from a screw or the teeth from a gear.
        2. (transitive) To remove color from hair, cloth, etc. to prepare it to receive new color.
        3. (transitive) (in Bridge) To remove all cards of a particular suit from another player. (See also, strip-squeeze.)
         
    Strontian Tweet Definition of Strontian Like Definition of Strontian on Facebook
    proper noun 
    1. A small village in Scotland that gives its name to the element strontium and the mineral strontianite which was discovered there
         
    strontium Tweet Definition of strontium Like Definition of strontium on Facebook
    noun 
    1. a metallic chemical element (symbol Sr) with an atomic number of 38.
         
    structural Tweet Definition of structural Like Definition of structural on Facebook
    adjective 
    1. of, relating to, or having structure
    2. used in building
         
    structural isomerism Tweet Definition of structural isomerism Like Definition of structural isomerism on Facebook
    noun 
    1. (chemistry) a form of isomerism in which the same atoms are arranged in different orders; either having the same or different functional groups
         
    styrene Tweet Definition of styrene Like Definition of styrene on Facebook
    noun 
    1. (chemistry) an aromatic hydrocarbon, vinyl-benzene; a colourless, oily liquid, used in the manufacture of polymers such as polystyrene
         
    suberic acid Tweet Definition of suberic acid Like Definition of suberic acid on Facebook
    noun 
    1. (chemistry) an aliphatic dicarboxylic acid, (CH2)6(COOH)2, obtained from cork; used in the manufacture of plastics
         
    subgroup Tweet Definition of subgroup Like Definition of subgroup on Facebook
    noun 
    1. A group within a larger group; a group whose members are some, but not all, of the members of a larger group.
    2. (grouptheory) A subset H of a group G that is itself a group and has the same binary operation as G.
         
    sublimate Tweet Definition of sublimate Like Definition of sublimate on Facebook
    verb (sublimat, ed)
    1. (physics) To change state from a solid to a gas (or from a gas to a solid) without passing through the liquid state (transitive or intransitive)
    2. To purify or refine a substance through such a change of state.
    3. (transitive), (psychoanalysis) To modify the natural expression of a sexual or primitive instinct in a socially acceptable manner; to divert the energy of such an instinct into some acceptable activity.
    4. (archaic) To raise to a place of honor.
         
    sublime Tweet Definition of sublime Like Definition of sublime on Facebook
    noun 
    1. something sublime
    verb (sublim, ing)
    1. (chemistry),(physics) to sublimate
    adjective 
    1. noble and majestic
    2. impressive and awe-inspiring
    3. terrifying
         
    suboxide Tweet Definition of suboxide Like Definition of suboxide on Facebook
    noun 
    1. (chemistry) any oxide containing a small proportion of oxygen
         
    substance Tweet Definition of substance Like Definition of substance on Facebook
    noun 
    1. Physical matter; material.
    2. The essential part of anything; the most vital part.
    3. Considerable wealth or resources.
    A man of .
    1. drugs
    abuse
         
    substituent Tweet Definition of substituent Like Definition of substituent on Facebook
    noun (plural: substituents)
    1. (chemistry) Any atom, group, or radical substituted for another, or entering a molecule in place of some other part which is removed.
         
    substitute Tweet Definition of substitute Like Definition of substitute on Facebook
    noun a substitute (plural: substitutes)
    1. a replacement or stand-in for something that achieves a similar result or purpose.
    verb (substitut, ing)
    1. (transitive) to replace with something that should function the same way
      • substitute X for Y
         
    substitution reaction Tweet Definition of substitution reaction Like Definition of substitution reaction on Facebook
    noun 
    1. (chemistry) a reaction in which one functional group is replaced with another
         
    succinic acid Tweet Definition of succinic acid Like Definition of succinic acid on Facebook
    noun 
    1. (organic compound) A colourless crystalline dicarboxylic acid, (CH2COOH)2, that occurs naturally in amber and is important in the metabolic Krebs cycle.
         
    sucrose Tweet Definition of sucrose Like Definition of sucrose on Facebook
    noun 
    1. (carbohydrate) A disaccharide with formula C12H22O11, consisting of two simple sugars, glucose and fructose; normal culinary sugar
         
    sugar Tweet Definition of sugar Like Definition of sugar on Facebook
    noun 
    1. (uncountable) Sucrose in the form of small crystals, obtained from sugar cane or sugar beet and used to sweeten food and drink.
    2. (countable) When used to sweeten drink, an amount of such crystalline sucrose approximately equal to five grams or one teaspoon.
    He usually has his coffee white with one .
    1. (context, countable, chemistry) Any of various small carbohydrates that are used by organisms to store energy.
    2. (countable) A generic term for sucrose, glucose, fructose, etc.
    3. (context, countable) A term of endearment.
    I'll be with you in a moment, .
    1. (context, countable, slang) A kiss.
    2. (context, mainly, _, southern, _, US, slang) effeminacy, Effeminacy in a male, often implying homosexuality.
    I think John has a little bit of in him
    verb 
    1. (transitive) To add sugar to; to sweeten with sugar.
    John heavily sugars his coffee.
    1. (transitive) To make (something unpleasant) seem less so.
    She has a gift for sugaring what would otherwise be harsh words.
         
    sulfate Tweet Definition of sulfate Like Definition of sulfate on Facebook
    noun 
    1. (chemistry) any salt or ester of sulfuric acid
    verb to sulfate
    1. (transitive) to treat something with sulfuric acid, a sulfate, or with sulfur dioxide
    2. (context, of a lead-acid battery) to accumulate a deposit of lead sulfate
         
    sulfide Tweet Definition of sulfide Like Definition of sulfide on Facebook
    noun 
    1. (chemistry) Any compound of sulfur and a metal or other electropositive element or group.
         
    sulfite Tweet Definition of sulfite Like Definition of sulfite on Facebook
    noun 
    1. (inorganic chemistry) Any salt of sulfurous acid.
         
    sulfonate Tweet Definition of sulfonate Like Definition of sulfonate on Facebook
    noun 
    1. (chemistry) any salt or ester of a sulfonic acid
         
    sulfonation Tweet Definition of sulfonation Like Definition of sulfonation on Facebook
    noun 
    1. (chemistry) The replacement of a hydrogen atom of an organic compound with a sulfonic acid (-SO3H) functional group, often by reaction with sulfuric acid at high temperatures
         
    sulfone Tweet Definition of sulfone Like Definition of sulfone on Facebook
    noun 
    1. (chemistry) any of a class or organic compounds that have a sulfonyl functional group attached to two carbon atoms; drugs of this structure have been used to treat leprosy
         
    sulfonic acid Tweet Definition of sulfonic acid Like Definition of sulfonic acid on Facebook
    noun 
    1. (chemistry) a strong inorganic acid, HSO2OH
    2. (chemistry) the univalent functional group -SO2OH
    3. (chemistry) any member of the the class or organic acids containing this group; used in detergents, dyes and ion exchange resins
         
    sulfonium Tweet Definition of sulfonium Like Definition of sulfonium on Facebook
    noun sulfnium
    1. (chemistry) the univalent H3S+ cation, derived from sulfane
         
    sulfonyl Tweet Definition of sulfonyl Like Definition of sulfonyl on Facebook
    noun 
    1. (chemistry) the bivalent radical or functional group -SO2-
         
    sulfoxide Tweet Definition of sulfoxide Like Definition of sulfoxide on Facebook
    noun 
    1. (chemistry) any compound of general formula R2S=O
         
    sulfur Tweet Definition of sulfur Like Definition of sulfur on Facebook
    noun (See Alternative spellings below for information on where this spelling and the alternative spelling sulphur are used)
    1. (uncountable) A chemical element (symbol S) with an atomic number of 16.
    2. (countable) (uncountable) A yellowish green colour, like that of sulfur.
    <table><tr><td>sulfur colour: &nbsp;</td><td bgcolor="
    1. E8FF93?" width="80">&nbsp; </td></tr></table>
    adjective 
    1. A yellowish green colour, like that of sulfur.
         
    sulfurate Tweet Definition of sulfurate Like Definition of sulfurate on Facebook
    verb to sulfurate
    1. (chemistry) to treat or to combine something with sulfur
         
    sulfur dioxide Tweet Definition of sulfur dioxide Like Definition of sulfur dioxide on Facebook
    noun 
    1. (inorganic compound) A toxic gas, of molecular formula SO2 that is found in the emissions of volcanos and those of burning coal or petroleum; dissolves in water to form sulfurous acid and, in the presence of oxygen, sulfuric acid, and is thus responsible for acid rain.
         
    sulfureous Tweet Definition of sulfureous Like Definition of sulfureous on Facebook
    adjective 
    1. (alternative spelling of, sulphureous)
         
    sulfuret Tweet Definition of sulfuret Like Definition of sulfuret on Facebook
    noun 
    1. (obsolete),(chemistry) sulfide
    verb to sulfuret
    1. to sulfurize
         
    sulfuric Tweet Definition of sulfuric Like Definition of sulfuric on Facebook
    adjective 
    1. (chemistry) of, or relating to sulfur, especially in its higher oxidation state
         
    sulfuric acid Tweet Definition of sulfuric acid Like Definition of sulfuric acid on Facebook
    noun 
    1. (inorganic compound) A transparent, oily liquid, formula H2SO4, that is a strong acid with very many industrial applications.
         
    sulfurize Tweet Definition of sulfurize Like Definition of sulfurize on Facebook
    verb to sulfurize
    1. to treat or react with sulfur or with sulfur dioxide
         
    sulfurous Tweet Definition of sulfurous Like Definition of sulfurous on Facebook
    adjective 
    1. containing sulfur
    2. (chemistry) of, or relating to sulfur, especially in its lower oxidation state
         
    sulfurous acid Tweet Definition of sulfurous acid Like Definition of sulfurous acid on Facebook
    noun 
    1. (inorganic compound) The weak acid, H2SO3, present in a solution of sulfur dioxide in water; it is a reducing agent and mild bleach.
         
    sulfur trioxide Tweet Definition of sulfur trioxide Like Definition of sulfur trioxide on Facebook
    noun 
    1. (inorganic compound) A corrosive liquid, SO3, which forms sulfuric acid on contact with water; made commercially by the oxidation of sulfur dioxide.
         
    sulfuryl Tweet Definition of sulfuryl Like Definition of sulfuryl on Facebook
    noun 
    1. (chemistry) the divalent radical and functional group SO2
         
    sulphurise Tweet Definition of sulphurise Like Definition of sulphurise on Facebook
    verb 
    1. (alternative spelling of, sulfurize)
         
    sulphurous Tweet Definition of sulphurous Like Definition of sulphurous on Facebook
    adjective 
    1. (context, mostly, UK) alternative spelling of sulfurous
         
    surfactant Tweet Definition of surfactant Like Definition of surfactant on Facebook
    noun 
    1. a surface active agent, or wetting agent, capable of reducing the surface tension of a liquid; typically organic compounds having a hydrophilic "head" and a hydrophobic "tail"
    2. a lipoprotein in the tissues of the lung that reduces surface tension and permits more efficient gas transport
         
    suspension Tweet Definition of suspension Like Definition of suspension on Facebook
    noun 
    1. The act of suspending, or the state of being suspended
    2. A temporary delay, interruption, or cessation; Of labor, study, pain, etc.; Of decision, determination, judgment, etc.; Of judgment or opinion in view of evidence to be produced.; Of the payment of what is due; as, the suspension of a mercantile firm or of a bank.; Of punishment, or sentence of punishment.; Of a person in respect of the exercise of his office, powers, prerogative, etc.; as, the suspension of a student or of a clergyman.; Of the action or execution of law, etc.; as, the suspension of the habeas corpus act.
    3. A conditional withholding, interruption, or delay; as, the suspension of a payment on the performance of a condition.
    4. The state of a solid when its particles are mixed with, but not dissolved in, a fluid, and are capable of separation by straining; also, any substance in this state.
    5. A keeping of the hearer in doubt and in attentive expectation of what is to follow, or of what is to be the inference or conclusion from the arguments or observations employed.
    6. (Scots Law) A stay or postponement of execution of a sentence condemnatory by means of letters of suspension granted on application to the lord ordinary.
    7. (music) The prolongation of one or more tones of a chord into the chord which follows, thus producing a momentary discord, suspending the concord which the ear expects; the discord so produced. Cf. retardation.
    1. (topology) A topological space derived from another by taking the product of the original space with an interval and collapse, collapsing each end of the product to a point.
    2. (topology) A function derived, in a standard way, from another, such that the instant function's domain and codomain are suspensions of the original function's.
         
    synthesis Tweet Definition of synthesis Like Definition of synthesis on Facebook
    noun (syntheses)
    1. the formation of something complex or coherent by combining simpler things
    2. (chemistry) the reaction of elements or compounds to form more complex compounds
    3. (logic) deduction from the general to the particular
    4. (philosophy) the combination of thesis and antithesis
    5. (Military) In intelligence usage, the examining and combining of processed information with other information and intelligence for final interpretation; (JP 1-02).
         
    synthesis gas Tweet Definition of synthesis gas Like Definition of synthesis gas on Facebook
    noun 
    1. the gas obtained by heating coal and steam; coal gas
         
    synthesize Tweet Definition of synthesize Like Definition of synthesize on Facebook
    verb (synthesiz, ing)
    1. (transitive) To combine two or more things to produce a new, more complex product.
    2. (intransitive, of two or more things) To be combined produce, producing a new, more complex product.
    3. (transitive, chemistry) To produce a substance by chemical synthesis.
    4. (intransitive, chemistry, of a substance) To be produced a by chemical synthesis.
         
    synthetic Tweet Definition of synthetic Like Definition of synthetic on Facebook
    noun 
    1. A synthetic compound.
    adjective 
    1. Of, or relating to synthesis.
    2. (chemistry) Produced by synthesis instead of being isolated from a natural source (but may be identical to a product so obtained).
    3. artificial, Artificial, not genuine.
    4. (grammar) Pertaining to the joining of bound morphemes in a word. Compare analytic.
         
    Synthol Tweet Definition of Synthol Like Definition of Synthol on Facebook
    proper noun &trade;
    1. an oil that is injected directly into muscle to artificially increase its size
         
    system Tweet Definition of system Like Definition of system on Facebook
    noun 
    1. A collection of organized things; as, a solar system.
    2. A way of organising or planning.
    3. A whole composed of relationships among the members.
    4. In music, a set of staffs that indicate instruments or sounds that are to be played simultaneously.
         
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