| flu | (noun) an acute febrile highly contagious viral disease | Synonyms: grippe, influenza |
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| flub | (noun) an embarrassing mistake | Synonyms: bloomer, blooper, blunder, boner, boo-boo, botch, bungle, foul-up, fuckup, pratfall |
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| (verb) make a mess of, destroy or ruin | Synonyms: ball up, blow, bobble, bodge, bollix, bollix up, bollocks, bollocks up, botch, botch up, bumble, bungle, fluff, foul up, fuck up, fumble, louse up, mess up, mishandle, muck up, muff, screw up, spoil |
| fluctuate | (verb) be unstable | - |
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| (verb) move or sway in a rising and falling or wavelike pattern | Synonyms: vacillate, waver |
| (verb) cause to fluctuate or move in a wavelike pattern | - |
| fluctuating | (adjective) having unpredictable ups and downs | - |
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| fluctuation | (noun) the quality of being unsteady and subject to changes | Synonyms: wavering |
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| (noun) an instance of change; the rate or magnitude of change | Synonyms: variation |
| (noun) a wave motion | - |
| flue | (noun) a conduit to carry off smoke | - |
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| (noun) organ pipe whose tone is produced by air passing across the sharp edge of a fissure or lip | Synonyms: flue pipe, labial pipe |
| (noun) flat bladelike projection on the arm of an anchor | Synonyms: fluke |
| fluegelhorn | (noun) a brass instrument resembling a cornet but with a wider bore | Synonyms: flugelhorn |
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| fluency | (noun) the quality of being facile in speech and writing | Synonyms: articulateness, volubility |
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| (noun) skillfulness in speaking or writing | - |
| (noun) powerful and effective language | Synonyms: eloquence, smoothness |
| fluent | (adjective) expressing yourself readily, clearly, effectively | Synonyms: eloquent, facile, silver-tongued, silver, smooth-spoken |
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| (adjective) smooth and unconstrained in movement | Synonyms: fluid, liquid, smooth |
| fluently | (adverb) in a fluent manner | - |
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| fluff | (noun) a blunder (especially an actor's forgetting the lines) | - |
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| (noun) something of little value or significance | Synonyms: bagatelle, frippery, frivolity |
| (noun) any light downy material | - |
| (verb) ruffle (one's hair) by combing the ends towards the scalp, for a full effect | Synonyms: tease |
| (verb) erect or fluff up | Synonyms: ruffle |
| (verb) make a mess of, destroy or ruin | Synonyms: ball up, blow, bobble, bodge, bollix, bollix up, bollocks, bollocks up, botch, botch up, bumble, bungle, flub, foul up, fuck up, fumble, louse up, mess up, mishandle, muck up, muff, screw up, spoil |
| fluffiness | (noun) a light softness | Synonyms: downiness, featheriness |
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| fluffy | (adjective) like down or as soft as down | Synonyms: downlike, downy, flossy |
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| flugelhorn | (noun) a brass instrument resembling a cornet but with a wider bore | Synonyms: fluegelhorn |
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| fluid | (adjective) subject to change; variable | Synonyms: unstable |
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| (adjective) in cash or easily convertible to cash | Synonyms: liquid |
| (adjective) smooth and unconstrained in movement | Synonyms: fluent, liquid, smooth |
| (adjective) characteristic of a fluid; capable of flowing and easily changing shape | Synonyms: runny |
| (adjective) affording change (especially in social status) | Synonyms: mobile |
| (noun) continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas | - |
| (noun) a substance that is fluid at room temperature and pressure | - |
| fluidity | (noun) the property of flowing easily | Synonyms: fluidness, liquidity, liquidness, runniness |
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| (noun) a changeable quality | Synonyms: fluidness |
| fluidness | (noun) the property of flowing easily | Synonyms: fluidity, liquidity, liquidness, runniness |
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| (noun) a changeable quality | Synonyms: fluidity |
| fluidounce | (noun) a United States unit of capacity or volume equal to 1.804 cubic inches | Synonyms: fluid ounce |
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| (noun) a British imperial unit of capacity or volume (liquid or dry) equal to 8 fluid drams or 28.416 cubic centimeters (1.734 cubic inches) | Synonyms: fluid ounce |
| fluidram | (noun) a unit of capacity or volume in the apothecary system equal to one eighth of a fluid ounce | Synonyms: drachm, fluid drachm, fluid dram |
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| (noun) a British imperial capacity measure (liquid or dry) equal to 60 minims or 3.5516 cubic centimeters | Synonyms: drachm, fluid drachm, fluid dram |
| fluke | (noun) parasitic flatworms having external suckers for attaching to a host | Synonyms: trematode, trematode worm |
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| (noun) either of the two lobes of the tail of a cetacean | - |
| (noun) flat bladelike projection on the arm of an anchor | Synonyms: flue |
| (noun) a barb on a harpoon or arrow | - |
| (noun) a stroke of luck | Synonyms: good fortune, good luck |
| flukey | (adjective) subject to accident or chance or change | Synonyms: chancy, fluky, iffy |
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| fluky | (adjective) subject to accident or chance or change | Synonyms: chancy, flukey, iffy |
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| flume | (noun) watercourse that consists of an open artificial chute filled with water for power or for carrying logs | - |
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| (noun) a narrow gorge with a stream running through it | Synonyms: gulch |
| flummery | (noun) meaningless ceremonies and flattery | Synonyms: mummery |
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| (noun) a bland custard or pudding especially of oatmeal | - |
| flummox | (verb) be a mystery or bewildering to | Synonyms: amaze, baffle, beat, bewilder, dumbfound, get, gravel, mystify, nonplus, perplex, pose, puzzle, stick, stupefy, vex |
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| flump | (verb) set (something or oneself) down with or as if with a noise | Synonyms: plank, plonk, plop, plump, plump down, plunk, plunk down |
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| (verb) fall heavily | Synonyms: flump down |
| flunitrazepam | (noun) a depressant and tranquilizer (trade name Rohypnol) often used in the commission of sexual assault; legally available in Europe and Mexico and Colombia | Synonyms: Rohypnol |
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| flunk | (noun) failure to reach a minimum required performance | Synonyms: failing |
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| (verb) fail to get a passing grade | Synonyms: bomb, fail, flush it |
| flunkey | (noun) a person of unquestioning obedience | Synonyms: flunky, stooge, yes-man |
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| (noun) a male servant (especially a footman) | Synonyms: flunky, lackey |
| flunky | (noun) a person of unquestioning obedience | Synonyms: flunkey, stooge, yes-man |
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| (noun) a male servant (especially a footman) | Synonyms: flunkey, lackey |
| fluor | (noun) a soft mineral (calcium fluoride) that is fluorescent in ultraviolet light; chief source of fluorine | Synonyms: fluorite, fluorspar |
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| fluorapatite | (noun) a form of apatite in which fluorine predominates over chlorine | - |
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| fluoresce | (verb) exhibit or undergo fluorescence | - |
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| fluorescein | (noun) a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed) | Synonyms: fluoresceine, fluorescent dye, resorcinolphthalein |
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| fluoresceine | (noun) a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed) | Synonyms: fluorescein, fluorescent dye, resorcinolphthalein |
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| fluorescence | (noun) light emitted during absorption of radiation of some other (invisible) wavelength | - |
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| fluorescent | (adjective) brilliantly colored and apparently giving off light | - |
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| (adjective) emitting light during exposure to radiation from an external source | - |
| (noun) a lighting fixture that uses a fluorescent lamp | Synonyms: fluorescent fixture |
| fluoridate | (verb) subject to fluoridation; treat with fluoride | Synonyms: fluoridise, fluoridize |
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| fluoridation | (noun) the addition of a fluoride to the water supply (to prevent dental decay) | Synonyms: fluoridisation, fluoridization |
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| fluoride | (noun) a salt of hydrofluoric acid | - |
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| fluoridisation | (noun) the addition of a fluoride to the water supply (to prevent dental decay) | Synonyms: fluoridation, fluoridization |
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| fluoridise | (verb) subject to fluoridation; treat with fluoride | Synonyms: fluoridate, fluoridize |
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| fluoridization | (noun) the addition of a fluoride to the water supply (to prevent dental decay) | Synonyms: fluoridation, fluoridisation |
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| fluoridize | (verb) subject to fluoridation; treat with fluoride | Synonyms: fluoridate, fluoridise |
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| fluorine | (noun) a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite | Synonyms: atomic number 9, F |
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| fluorite | (noun) a soft mineral (calcium fluoride) that is fluorescent in ultraviolet light; chief source of fluorine | Synonyms: fluor, fluorspar |
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| fluoroboride | (noun) a salt of fluoroboric acid | - |
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| fluorocarbon | (noun) a halocarbon in which some hydrogen atoms have been replaced by fluorine; used in refrigerators and aerosols | - |
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| fluorochrome | (noun) any of various fluorescent substances used in fluorescence microscopy to stain specimens | - |
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| fluoroform | (noun) colorless gas haloform CHF3 (similar to chloroform) | Synonyms: trifluoromethane |
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| fluoroscope | (noun) an X-ray machine that combines an X-ray source and a fluorescent screen to enable direct observation | Synonyms: roentgenoscope |
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| fluoroscopy | (noun) examination of body structures using a fluoroscope | - |
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| fluorosis | (noun) a pathological condition resulting from an excessive intake of fluorine (usually from drinking water) | - |
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| fluorouracil | (noun) an antimetabolite used to treat certain cancers | - |
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| fluorspar | (noun) a soft mineral (calcium fluoride) that is fluorescent in ultraviolet light; chief source of fluorine | Synonyms: fluor, fluorite |
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| fluosilicate | (noun) salt of fluosilicic acid | - |
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| fluoxetine | (noun) a selective-serotonin reuptake inhibitor commonly prescribed as an antidepressant (trade names Prozac or Sarafem); it is thought to work by increasing the activity of serotonin in the brain | Synonyms: fluoxetine hydrocholoride, Prozac, Sarafem |
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| fluphenazine | (noun) tranquilizer used to treat psychotic disorders | - |
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| flurazepam | (noun) tranquilizer (trade name Dalmane) used to treat insomnia | Synonyms: Dalmane, flurazepam hydrochloride |
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| flurbiprofen | (noun) a nonsteroidal anti-inflammatory drug (trade name Ansaid) that is administered only orally | Synonyms: Ansaid |
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| flurry | (noun) a rapid active commotion | Synonyms: ado, bustle, fuss, hustle, stir |
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| (noun) a light brief snowfall and gust of wind (or something resembling that) | Synonyms: snow flurry |
| (verb) cause to feel embarrassment | Synonyms: confuse, disconcert, put off |
| (verb) move in an agitated or confused manner | - |
| flush | (adjective) of a surface exactly even with an adjoining one, forming the same plane | - |
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| (adjective) having an abundant supply of money or possessions of value | Synonyms: affluent, loaded, moneyed, substantial, wealthy |
| (noun) sudden reddening of the face (as from embarrassment or guilt or shame or modesty) | Synonyms: blush |
| (noun) a sudden rapid flow (as of water) | Synonyms: gush, outpouring |
| (noun) the swift release of a store of affective force | Synonyms: bang, boot, charge, kick, rush, thrill |
| (noun) a poker hand with all 5 cards in the same suit | - |
| (noun) a rosy color (especially in the cheeks) taken as a sign of good health | Synonyms: bloom, blush, rosiness |
| (noun) sudden brief sensation of heat (associated with menopause and some mental disorders) | Synonyms: hot flash |
| (noun) the period of greatest prosperity or productivity | Synonyms: bloom, blossom, efflorescence, flower, heyday, peak, prime |
| (adverb) squarely or solidly | - |
| (adverb) in the same plane | - |
| (verb) turn red, as if in embarrassment or shame | Synonyms: blush, crimson, redden |
| (verb) cause to flow through something | - |
| (verb) rinse, clean, or empty with a liquid | Synonyms: purge, scour |
| (verb) irrigate with water from a sluice | Synonyms: sluice |
| (verb) cause to flow or flood with or as if with water | - |
| (verb) make level or straight | Synonyms: even, even out, level |
| (verb) glow or cause to glow with warm color or light | - |
| flushed | (adjective) (especially of the face) reddened or suffused with or as if with blood from emotion or exertion | Synonyms: crimson, red-faced, red, reddened |
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| (adjective) having the pinkish flush of health | Synonyms: rose-cheeked, rosy-cheeked, rosy |
| fluster | (noun) a disposition that is confused or nervous and upset | Synonyms: perturbation |
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| (verb) cause to be nervous or upset | - |
| (verb) be flustered; behave in a confused manner | - |
| flustered | (adjective) thrown into a state of agitated confusion; (`rattled' is an informal term) | Synonyms: hot and bothered, perturbed, rattled |
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| flute | (noun) a high-pitched woodwind instrument; a slender tube closed at one end with finger holes on one end and an opening near the closed end across which the breath is blown | Synonyms: transverse flute |
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| (noun) a groove or furrow in cloth etc (particularly a shallow concave groove on the shaft of a column) | Synonyms: fluting |
| (noun) a tall narrow wineglass | Synonyms: champagne flute, flute glass |
| (verb) form flutes in | - |
| fluting | (noun) a groove or furrow in cloth etc (particularly a shallow concave groove on the shaft of a column) | Synonyms: flute |
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| flutist | (noun) someone who plays the flute | Synonyms: flautist, flute player |
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| flutter | (noun) the act of moving back and forth | Synonyms: flicker, waver |
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| (noun) the motion made by flapping up and down | Synonyms: flap, flapping, fluttering |
| (noun) abnormally rapid beating of the auricles of the heart (especially in a regular rhythm); can result in heart block | - |
| (noun) a disorderly outburst or tumult | Synonyms: commotion, disruption, disturbance, hoo-ha, hoo-hah, hurly burly, kerfuffle, to-do |
| (verb) wink briefly | Synonyms: bat |
| (verb) beat rapidly | Synonyms: palpitate |
| (verb) move back and forth very rapidly | Synonyms: flicker, flitter, quiver, waver |
| (verb) move along rapidly and lightly; skim or dart | Synonyms: dart, fleet, flit |
| (verb) flap the wings rapidly or fly with flapping movements | - |
| fluttering | (noun) the motion made by flapping up and down | Synonyms: flap, flapping, flutter |
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| fluvastatin | (noun) least expensive statin drug (trade name Lescol); usually taken orally at bedtime | Synonyms: Lescol |
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| fluvial | (adjective) of or relating to or happening in a river | - |
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| flux | (noun) in constant change | - |
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| (noun) (physics) the number of changes in energy flow across a given surface per unit area | Synonyms: flux density |
| (noun) a flow or discharge | Synonyms: fluxion |
| (noun) the lines of force surrounding a permanent magnet or a moving charged particle | Synonyms: magnetic field, magnetic flux |
| (noun) excessive discharge of liquid from a cavity or organ (as in watery diarrhea) | - |
| (noun) a state of uncertainty about what should be done (usually following some important event) preceding the establishment of a new direction of action | Synonyms: state of flux |
| (noun) a substance added to molten metals to bond with impurities that can then be readily removed | - |
| (noun) the rate of flow of energy or particles across a given surface | - |
| (verb) mix together different elements | Synonyms: blend, coalesce, combine, commingle, conflate, fuse, immix, meld, merge, mix |
| (verb) become liquid or fluid when heated | Synonyms: liquefy, liquify |
| (verb) move or progress freely as if in a stream | Synonyms: flow |
| fluxion | (noun) a flow or discharge | Synonyms: flux |
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| fluxmeter | (noun) meter that measures magnetic flux by the current it generates in a coil | - |
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