| F |
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noun
- The sixth letter of the Appendix:Roman script, English alphabet, preceded by E and followed by G.
- A failing grade in a class or course. The next best grade is a D. Some institutions issue Es instead of Fs.
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| fat-soluble |
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adjective
- soluble in lipids, and in organic solvents
- that tends to accumulate in the adipose tissue of the body
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| ferrate |
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noun
- (chemistry) The anion FeO?42- in which iron is in a +6 formal oxidation state.
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| ferric |
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adjective - Pertaining to, derived from, or containing iron.
- (chemistry) of compounds of iron in which it has a valence or oxidation number of 3
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| ferricyanide |
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noun - (chemistry) any of various salts containing the trivalent anion Fe(CN)63-; used in making blue pigments
- (chemistry) a complex ion in which a central ferric iron atom is surrounded by six cyanide ions
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| ferrite |
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noun
- the interstitial solid solution of carbon in body-centered cubic iron
- any of a class of metal oxides which show ferrimagnetism; used in transformers, inductors, antennas, recording heads, microwave devices, motors and loudspeakers
- (inorganic compound) The anion FeO?22-, and any of the salts (formally derived from the unknown ferrous acid) derived from it
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| ferrocene |
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noun
- any of a class of metallocenes containing an iron atom between two cyclopentadienyl rings; especially the simplest of the class bis-cyclopentadienyl iron
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| ferrocyanide |
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noun - (chemistry) any of various salts containing the trivalent anion Fe(CN)64-; used in making blue pigments
- (chemistry) a complex ion in which a central ferrous iron atom is surrounded by six cyanide ions
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| ferrous |
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adjective
- of, or containing iron
- (chemistry) of compounds of iron in which it has a valence or oxidation number of 2
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| fiber |
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noun (fibre, fibres outside US)
- (countable) A single piece of a given material, elongated and roughly round in cross-section, often twisted with other fibers to form thread.
- The microscope showed a single blue stuck to the sole of the shoe.
- (uncountable) Material in the form of fibers.
- The cloth was made from strange, somewhat rough .
- (textiles) A material whose length is 1000 times its width or more.
- Please find use polyester for this shirt.
- Dietary fiber.
- Fresh vegetables are a good source of fiber'.''
- Moral strength and resolve.
- The ordeal was a test of everyone's .
- (mathematics) The preimage of a given point in the range of a map.
- Under this map, any two values in the of a given point on the circle differ by 2π
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| filter |
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noun
- A device which separates a suspended, dissolved, or particulate matter from a fluid, solution, or other substance; any device that separates one substance from another.
- Electronics or software that separates unwanted signals (for example noise) from wanted signals or that attenuates selected frequencies.
- Any item, mechanism, device or procedure that acts to separate or isolate.
- He runs an email to catch the junk mail.
verb
- (transitive) To sort, sift, or isolate.
- This strainer should out the large particles.
- (transitive) To diffuse; to cause to be less concentrated or focused.
- The leaves of the trees filtered the light.
- (intransitive) To pass through a filter or to act as though passing through a filter.
- The water filtered through the rock and soil.
- (intransitive) To move slowly or gradually; to come or go a few at a time.
- The crowd filtered into the theater.
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| filtrate |
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noun
- The liquid or solution that has passed through a filter, and which has been separated from the filtride.
verb (filtrat, ing)
- To filter.
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| firework |
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noun
- A device using gunpowder and other chemicals which, when lit, emits a combination of coloured flames, sparks, whistles or bangs for entertainment purposes.
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| Fischer-Tropsch process |
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noun
- (organic chemistry) The synthesis of hydrocarbons by the catalytic hydrogenation of carbon monoxide.
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| fishtail |
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noun
- The tail of a fish, or an object resembling this.
verb
- (intransitive) To swing the back of a vehicle (originally an aircraft) from side to side.
- As we approached the runway, the pilot fishtailed slightly to reduce landing speed.
- (intransitive) (idiom) To move with the tail swinging from side to side in this way.
- The car fishtailed down the muddy lane.
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| flash point |
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noun ((plural): flash points)
- The lowest temperature at which a liquid can form an ignitable mixture in air near the surface of the liquid.
- A hotspot; a dangerous place of violent political unrest
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| flavone |
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noun - (chemistry) any of a class of tricyclic aromatic heterocyclic ketones, especially the naturally occurring flavonoids
- (chemistry) the parent compound of this class
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| floc |
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noun - An alternative word for floccule. A soft or fluffy particle suspended in a liquid or the fluffy mass of suspended particles so formed. Floc may be mineral as for clay, chemical as in water treatment or biology, biological as in sewage treatment.
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| flocculent |
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adjective
- flocculated, Flocculated, resembling bits of wool, woolly.
- Covered in a woolly substance; downy.
- flaky, Flaky.
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| flower |
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noun
- (botany) A reproductive structure in angiosperms (flowering plants), typically including sepals, petals, stamens, and ovary, ovaries; often conspicuously colourful.
- 1894, w:H. G. Wells, H. G. Wells, s:The Flowering of the Strange Orchid, The Flowering of the Strange Orchid
- You know, Darwin studied their fertilisation, and showed that the whole structure of an ordinary orchid was contrived in order that moths might carry the pollen from plant to plant.
- (vulgar, hypocoristic) The vulva, especially the labia majora.
- An inflorescence that resembles a flower, but actually contains many small florets, such as a sunflower.
- A plant that bears flowers.
- We transplanted the flowers to a larger pot.
- (context, usually with in) Of plants, a state of bearing blooms.
- The dogwoods are in this week.
- (idiomatic) The best examples or representatives of a group.
- We selected the of the applicants.
- (idiomatic) The best state of things; the prime.
- She was in the of her life.
verb
- To put forth blooms.
- (idiomatic) To reach a state of full development or great achievement.
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| fluor- |
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prefix - (chemistry) Form of fluoro- used before a vowel.
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| fluoresce |
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verb (fluoresc, ing)
- (intransitive, physics) To emit electromagnetic radiation, especially visible light, when absorbing radiation of some other wavelength.
- (context, intransitive, of colours) to be very bright, easy to see, dayglo.
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| fluorescein |
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noun - (chemistry) any of a class of yellow xanthene dyes which are visible when highly diluted; used forensically to detect traces of blood, and in analytical chemistry as an indicator in silver nitrate titrations
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| fluoric |
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adjective - (chemistry) Pertaining to, obtained from or containing fluorine.
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| fluoridate |
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verb (fluoridates, fluoridating, fluoridated, fluoridated)
- (context, chemistry, dentistry) To add fluoride to something, especially to drinking water in order to reduce tooth decay.
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| fluoride |
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noun
- (chemistry) Any salt of hydrofluoric acid; for example, potassium fluoride.
- (chemistry) A binary compound of fluorine and another element or radical.
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| fluorimeter |
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noun
- a fluorometer
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| fluorinate |
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verb (fluorinates, fluorinating, fluorinated, fluorinated)
- (context, chemistry, transitive) To introduce fluorine into a compound.
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| fluoro- |
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prefix (also fluor- before a vowel)
- fluorine
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| fluorocarbon |
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noun - (chemistry) any derivative of a hydrocarbon in which every hydrogen atom has been replaced by fluorine
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| fluorometer |
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noun
- An instrument used to detect, and measure fluorescence
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| FM |
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abbreviation
- (geography) Federated States of Micronesia
initialism
- Frequency Modulation
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| foam |
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noun
- A substance composed of a large collection of bubbles or their solidified remains.
- He doesn't like so much in his beer.
- A mat can soften a hard seat.
verb
- To form or emit a foam; to bubble.
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| fog |
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noun
- A new growth of grass appearing on a field that has been mowed or grazed.
- Tall and decaying grass left standing after the cutting or grazing season.
- (Scottish) moss, Moss.
verb (fog, g, ed)
- (intransitive) To become covered with or as if with fog.
- (intransitive) To become obscured in condensation or water.
- The mirror fogged every time he showered.
- (context, intransitive, photography) To become dim or obscure.
- (transitive) To cover with or as if with fog.
- (transitive) To obscure in condensation or water.
- (transitive) To make confusing or obscure.
- (context, transitive, photography) To make dim or obscure.
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| formaldehyde |
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noun
- (organic compound) The simplest aldehyde, H-CHO, a colourless gas having many industrial applications; it dissolves in water to give formalin.
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| formalin |
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noun
- (organic chemistry) A clear, colorless, aqueous solution of 37% formaldehyde; used as a disinfectant and to preserve biological specimens.
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| formate |
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noun - (chemistry) any salt or ester of formic acid
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| formic |
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adjective - Pertaining to, or derived from, ants; as, formic acid.
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| formula |
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noun (plural formulae in scientific use, formulas in informal use)
- (mathematics) Any mathematical rule expressed symbolically.
- <math>x = \frac {-b \pm \sqrt{b^2 - 4ac}}{2a}</math> is the formula for finding the roots of the quadratic equation y = ax2 + bx + c.
- (chemistry) A symbolic expression of the structure of a compound.
- H2O is the formula for water (Dihydrogen monoxide)
- A plan of action intended to solve a problem.
- A formulation; a prescription; a mixture or solution made in a prescribed manner; the identity and quanties of ingredients of such a mixture.
- The formula of the rocket fuel has not been revealed.
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| fraction |
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noun
- a part of a whole, especially a comparatively small part.
- (arithmetic) a ratio of two integers, the numerator and the denominator, usually written one above the other and separated by a vinculum (horizontal bar)
- (chemistry) a component of a mixture, separated by fractionation.
- In a Eucharistic service, the breaking of the Host.
verb
- divide or break into fractions.
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| fractional |
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adjective
- Pertaining to a fraction.
- divide, Divided; fragmentary; incomplete.
- Very small; minute.
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| francium |
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noun
- A metallic chemical element (symbol Fr) with an atomic number of 87.
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| freezing point |
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noun
- the temperature at which a liquid freezes, and the solid and liquid phases are in equilibrium; normally the same as the melting point
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| Friedel-Crafts reaction |
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noun
- (chemistry) a substitution reaction in which an alkyl or acyl functional group replaces a hydrogen atom of an aromatic nucleus; it is catalyzed by aluminium chloride
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| fullerene |
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noun
- any of a class of allotropes of carbon having hollow molecules whose atoms lie at the vertices of a polyhedron having 12 pentagonal and 2 or more hexagonal faces
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| fulminate |
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noun
- (chemistry) Any salt or ester of fulminic acid; mostly explosive.
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| fulminic acid |
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noun - (chemistry) Iso-cyanic acid, HCNO, an unstable compound which forms explosive salts
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| fumaric acid |
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noun (or trans-butenedioic acid)
- (chemistry) an unsaturated organic dicarboxylic acid, HOOCCH=CHCOOH, the geometric isomer of maleic acid from which it may be prepared by heating; it is found in many plants, including fungi and mosses, and is essential in the chemistry of respiration; it has a number of industrial applications, and its esters, the fumarates are used in the treatment of psoriasis
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| fumigant |
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noun
- Any substance used, in the gaseous state, to fumigate or disinfect
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| fumigate |
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verb (fumigat, ing)
- To disinfect, purify, or rid of vermin with the fumes of certain chemicals.
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| fuming sulfuric acid |
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noun
- (inorganic compound) Any solution of sulfur trioxide in sulfuric acid; it contains pyrosulfuric acid, and is used in the manufacture of nitroglycerine etc.
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| functional group |
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noun
- (organic chemistry) A specific grouping of elements that is characteristic of a class of compounds, and determines some properties and reactions of that class.
- (ecology) A collection of organisms of specific morphological, physiological, behavioral, biochemical properties.
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| furan |
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noun - (organic chemistry) Any of a class of aromatic heterocyclic compounds containing a ring of four carbon atoms and an oxygen atom; especially the simplest one, C4H4O.
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| furfural |
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noun - (chemistry) a heterocyclic aldehyde derivative of furan; it is obtained commercially from bran, and has several industrial uses
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