| 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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| 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 |
| 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 | - |
| fluffiness | (noun) a light softness | Synonyms: downiness, featheriness |
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| flugelhorn | (noun) a brass instrument resembling a cornet but with a wider bore | Synonyms: fluegelhorn |
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| fluid | (noun) continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas | - |
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| (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 |
| 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 | - |
| 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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| 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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| 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 | (noun) a lighting fixture that uses a fluorescent lamp | Synonyms: fluorescent fixture |
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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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| fluoridization | (noun) the addition of a fluoride to the water supply (to prevent dental decay) | Synonyms: fluoridation, fluoridisation |
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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 |
| flush | (noun) sudden reddening of the face (as from embarrassment or guilt or shame or modesty) | Synonyms: blush |
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| (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 |
| fluster | (noun) a disposition that is confused or nervous and upset | Synonyms: perturbation |
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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 |
| 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 |
| 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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| 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 | - |
| 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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