| Earth |
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proper noun
- The third planet in order from the Sun, upon which humans live; represented in astronomy and astrology by � and �.
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| elastomer |
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noun
- any polymer having the elastic properties of rubber
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| elective |
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adjective
- Of, or pertaining to voting or elections
- That involves a choice between options; optional or discretionary
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| electrolysis |
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noun
- (chemistry) the chemical change produced by passing an electric current through a conducting solution or a molten salt
- the destruction of hair roots by means of an electric current
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| electrolytic |
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adjective
- of, relating to, or using electrolysis
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| electronegative |
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adjective
- having a negative electric charge
- (chemistry) tending to attract electrons to form a chemical bond
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| electrophilic |
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adjective - (chemistry) of, or relating to an electrophile; electron deficient
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| electrophoresis |
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noun
- the migration of electrically charged molecules through a medium under the influence of an electric field
- a method for the separation and analysis of large molecules (such as proteins) by migrating a colloidal solution of them through a gel; gel electrophoresis
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| electropositive |
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adjective
- having a positive electric charge
- (chemistry) tending to release electrons to form a chemical bond
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| element |
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noun
- (chemistry) Any one of the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means and made up of atoms all having the same number of protons.
- One of the four basic building blocks of matter in theories of ancient philosophers and alchemists: water, earth, fire, and air.
- Something small.
- an of doubt
- A place or state of being that an individual or object is better suited towards.
- be in one's own
- A required aspect or component of a cause of action. A deed is regarded a violation of law only if each element can be proved.
- (set theory) One of the objects in a set.
- A group of people within a larger group having a particular common characteristic.
- You sometimes find the hooligan at football matches.
- A short form of heating element, a component in electrical equipment, often in the form of a coil, having a high resistance, thereby generating heat when a current is passed through it.
- The in this electric kettle can heat the water in under a minute.
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| elementary |
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adjective - Relating to the basic, essential or fundamental part of something.
- Relating to an elementary school.
- (physics) Relating to a subatomic particle.
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| eluate |
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noun - A liquid solution that results from elution.
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| elute |
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verb (elut, ing)
- (transitive) The act of separating one substance from another by means of a solvent; to wash; to cleanse.
- A mixture of isooctane and ethyl acetate can be used to triglycerides from a complex lipid solution.
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| elutriate |
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verb
- to decant; to purify something by straining it
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| emanation |
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noun
- The act of flowing or proceeding from a fountain head or origin.
- That which issues, flows, or proceeds from any object as a source; efflux; an effluence; as, perfume is an emanation from a flower.
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| empirical formula |
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noun
- (chemistry) A notation indicating the ratios of the various elements present in a compound, without regard to the actual numbers.
- The molecular formula for ethane is C2H6, while the is CH3.
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| emulsion |
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noun
- a stable suspension of small droplets of one liquid in another with which it is immiscible
- mayonnaise, Mayonnaise is an where egg is used to keep oil and water mixed.
- (chemistry) a colloid in which both phases are liquid
- the coating of photosensitive silver halide grains in a thin gelatine layer on a photographic film
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| enantiomer |
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noun - (chemistry) One of a pair of stereoisomers that is the mirror image of the other, but may not be superimposed on this other stereoisomer. Almost always, a pair of enantiomers contain at least one chiral centre, and a sample of either enantiomer will be optically active.
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| endoergic |
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adjective - (physics),(chemistry) occuring with the absorption of energy; endothermic
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| endosmosis |
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noun
- osmosis in which fluid flows through a membrane towards a region of higher concentration
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| endothermic |
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adjective
- (chemistry): Of a chemical reaction that absorbs heat energy from its surroundings.
- (zoology): Of an animal whose body temperature is regulated by internal factors.
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| enol |
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noun - (organic chemistry) An organic compound containing a hydroxyl group bonded to a carbon atom, which is doubly bonded to another carbon atom.
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| enolate |
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noun - (chemistry) any metal salt of the enol form of a tautomeric aldehyde or ketone
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| entrain |
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verb
- (poetic) To get into or board a train.
- (chemistry) To suspend small particles in the current of a fluid.
- (figurative) To encarriage, to conjoin, to link; as in a series of entities, elements, objects or processes.
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| epichlorohydrin |
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noun - (chemistry) any epihalohydrin in which the halogen is chlorine
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| epimer |
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noun - (chemistry) any diastereoisomer that has the opposite configuration at only one of the stereogenic centres
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| epoxide |
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noun - (organic chemistry) Any of a class of organic compound, cyclic ethers, having a three-membered ring; they are prepared by the selective oxidation of alkenes or by ring-closure of halohydrins; used to make plastics.
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| epoxy |
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noun (epox, ies)
- A thermosetting resin used chiefly in strong adhesives, coatings and laminates; epoxy resin.
adjective
- (chemistry) Derived from an epoxide.
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| equation |
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noun
- (math) An assertion that two expressions are equal, expressed by writing the two expressions separated by an equal sign; from which one is to determine a particular quantity.
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| equilibrium |
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noun (plural equilibria)
- The condition of a system in which competing influences are balanced.
- (physics) The state of a body at rest or in uniform motion in which the resultant of all forces on it is zero.
- (chemistry) The state of a reaction in which the rates of the forward and reverse reactions are the same.
- Mental balance.
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| equivalence |
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noun
- The condition of being equivalent or essentially equal.
- (mathematics) An equivalence relation.
- (logic) The relationship between two propositions that are either both true or both false.
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| equivalent |
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noun
- anything that is virtually equal to another
- (chemistry) an equivalent weight
adjective
- similar or identical in value, meaning or effect; virtually equal
- (mathematics) of two sets, having a one-to-one relationship
- (mathematics) relating to the corresponding elements of an equivalence relation
- (chemistry) having the equal ability to combine
- (cartography) of a map, equal-area
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| equivalent weight |
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noun
- (chemistry) the atomic weight of an element or radical divided by its valence; the molecular weight of a compound divided by its combining power in a specific reaction
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| erucic acid |
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noun - a long chain unsaturated fatty acid, CH3(CH2)7CH=CH(CH2)11COOH, found in rapeseed and mustard seed oils; the cis- isomer is erucic acid, the trans- isomer is brassidic acid
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| erythorbate |
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noun - (chemistry) any salt or ester of erythorbic acid
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| erythorbic acid |
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noun - (chemistry) a stereoisomer of ascorbic acid that does not occur naturally
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| ester |
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noun
- (organic chemistry) A compound most often formed by the condensation of an alcohol and an acid, with elimination of water. It contains the functional group carbon-oxygen double bond joined via carbon to another oxygen atom.
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| esterify |
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verb to esterify
- (chemistry) (of an acid) to combine with an alcohol or (of an alcohol) to combine with an acid, to form an ester
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| ET |
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initialism
- Eastern Time (synonyms: EST, Eastern Standard Time, EDT. Eastern Daylight Time)
- extraterrestrial
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| ethane |
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noun
- (organic compound) An aliphatic hydrocarbon, C2H6, gaseous at normal temperatures and pressures, being a constituent of natural gas.
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| ethanol |
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noun
- (organic compound) A simple aliphatic alcohol derived from ethane: CH3-CH2-OH
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| ethanolamine |
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noun - (chemistry) a hydroxy-amine, HO.CH2.CH2.NH2, manufactured by the reaction of ethylene oxide with ammonia; it is found naturally in a combined form in cephalin, and has many industrial applications
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| ethene |
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noun
- (organic compound) The official IUPAC name for the organic chemical compound ethylene. The simplest alkene, a colorless gaseous (at room temperature and pressure) hydrocarbon with the chemical formula C2H4.
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| ethereal |
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adjective
- Pertaining to the hypothetical upper, purer air, or to the higher regions beyond the earth or beyond the atmosphere; celestial; as, ethereal space; ethereal regions.
- 1667: w: John Milton, Milton, Paradise Lost, book VII
- : Go, heavenly guest, messenger.
- 1862: w:Henry David Thoreau, Thoreau, http://wikisource.org/wiki/Walking Walking.
- : I trust that we shall be more imaginative, that our thoughts will be clearer, fresher, and more , as our sky,...
- Consisting of ether; hence, exceedingly light or airy; tenuous; spiritlike; characterized by extreme delicacy, as form, manner, thought, etc.
- 1733: w:Alexander Pope, Pope, http://onlinebooks.library.upenn.edu/webbin/gutbook/lookup?num=2428 An Essay on Man
- : Vast chain of being, which from God began, Natures , human, angel, man.
- Delicate, light and airy.
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| ethoxide |
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noun - (chemistry) the anion CH3CH2O− derived from ethanol by the loss of a proton
- (chemistry) any salt of this anion
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| ethyl |
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noun - Is a univalent, hydrocarbon radical of the paraffin series, forming the essential radical of ethane, and of common alcohol and ether.
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| ethyl alcohol |
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noun
- (organic compound) Older name for ethanol, a type of alcohol.
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| ethylamine |
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noun - (chemistry) a colourless, volatile liquid amine, CH3.CH2.NH2 having many industrial applications
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| ethylene |
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noun
- (organic compound) The common name for the organic chemical compound ethene. The simplest alkene, a colorless gaseous (at room temperature and pressure) hydrocarbon with the chemical formula C2H4.
- (organic chemistry) The divalent radical derived from ethane.
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| ethylene glycol |
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noun - (organic compound) An organic compound, HO-CH2-CH2-OH, and the chemical structure at right. It is a clear, colorless liquid under normal conditions, and is widely used as a vehicle engine coolant due to its anti-freeze properties.
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| ethylene oxide |
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noun
- (organic compound) The simplest epoxide; used as a sterilizing agent and in the production of ethylene glycol.
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| ethyl mercaptan |
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noun - (chemistry) a thiol formally derived from ethyl alcohol by replacing the oxygen atom with sulfur
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| ethyne |
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noun
- (organic compound) The official IUPAC name for the organic chemical compound acetylene. The simplest alkyne, a colorless gaseous (at room temperature and pressure) hydrocarbon with the chemical formula C2H2.
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| EU |
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initialism
- (economics) European Union
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| eutectic |
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adjective - (Physics) Of maximum fusibility;—said of an alloy or mixture which has the lowest melting point which it is possible to obtain by the combination of the given components.
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| exaltation |
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noun
- The act of exalt, exalting or raising high; also, the state of being exalted; elevation.
- The refinement or subtilization of a body, or the increasing of its virtue or principal property.
- That placement of a planet in the zodiac in which it is deemed to exert its strongest influence.
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| exoergic |
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adjective - (context, physics, chemistry) Occuring with the release of energy.
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| exosmosis |
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noun
- osmosis in which fluid flows through a membrane towards a region of lower concentration
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| exothermic |
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adjective
- (chemistry) Of a chemical reaction that releases energy in the form of heat.
- (zoology) Of an animal whose body temperature is regulated by external factors.
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| extract |
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noun
- That which is extracted or drawn out.
- A portion of a book or document, separately transcribed; a citation; a quotation.
- A decoction, solution, or infusion made by drawing out from any substance that which gives it its essential and characteristic virtue; essence; as, extract of beef; extract of dandelion; also, any substance so extracted, and characteristic of that from which it is obtained; as, quinine is the most important extract of Peruvian bark.
- A solid preparation obtained by evaporating a solution of a drug, etc., or the fresh juice of a plant; -- distinguished from an abstract.
- A peculiar principle once erroneously supposed to form the basis of all vegetable extracts; -- called also the extractive principle.
- Extraction; descent.
- A draught or copy of writing; certified copy of the proceedings in an action and the judgement therein, with an order for execution.
verb
- (transitive) To draw out or forth; to pull out; to remove forcibly from a fixed position, as by traction or suction, etc.; as, to extract a tooth from its socket, a stump from the earth, a splinter from the finger.
- (transitive) To withdraw by expression, distillation, or other mechanical or chemical process; as, to extract an essence. Cf. Abstract, v. t., 6.
- (transitive) To take by selection; to choose out; to cite or quote, as a passage from a book.
- (context, transitive, arithmetic) To determine (a root of a number).
- Please the third root of 27.
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| extricate |
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verb (extricat, ing)
- (transitive) To free, disengage, loosen, or untangle.
- I finally managed to myself from the tight jacket.
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