| aliquot | (noun) an integer that is an exact divisor of some quantity | Synonyms: aliquot part |
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| antimuon | (noun) the antiparticle of a muon; decays to positron and neutrino and antineutrino | Synonyms: positive muon |
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| antitauon | (noun) an antilepton of very great mass | Synonyms: tau-plus particle |
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| arduousness | (noun) extreme effortfulness | Synonyms: strenuousness |
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| assiduousness | (noun) great and constant diligence and attention | Synonyms: assiduity, concentration |
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| autofluorescence | (noun) self-induced fluorescence | - |
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| buoy | (noun) a float attached by rope to the seabed to mark channels in a harbor or underwater hazards; typically brightly-coloured | - |
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| buoyancy | (noun) the property of something weightless and insubstantial | Synonyms: airiness |
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| (noun) irrepressible liveliness and good spirit | Synonyms: irrepressibility |
| (noun) the tendency to float in water or other liquid | - |
| (noun) cheerfulness that bubbles to the surface | Synonyms: perkiness |
| chlorofluorocarbon | (noun) a fluorocarbon with chlorine; formerly used as a refrigerant and as a propellant in aerosol cans | Synonyms: CFC |
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| congruousness | (noun) the quality of agreeing; being suitable and appropriate | Synonyms: congruence, congruity |
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| conspicuousness | (noun) high visibility | - |
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| (noun) the state of being conspicuous | - |
| contemptuousness | (noun) the manifestation of scorn and contempt | - |
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| contiguousness | (noun) the attribute of being so near as to be touching | Synonyms: adjacency, contiguity |
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| continuo | (noun) a bass part written out in full and accompanied by numbers to indicate the chords to be played | Synonyms: basso continuo, figured bass, thorough bass |
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| continuousness | (noun) the quality of something that continues without end or interruption | Synonyms: ceaselessness, incessancy, incessantness |
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| disingenuousness | (noun) the quality of being disingenuous and lacking candor | - |
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| duo | (noun) a musical composition for two performers | Synonyms: duet, duette |
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| (noun) a pair who associate with one another | Synonyms: couple, duet, twosome |
| (noun) two performers or singers who perform together | Synonyms: duet, duette |
| (noun) two items of the same kind | Synonyms: brace, couple, couplet, distich, duad, duet, dyad, pair, span, twain, twosome, yoke |
| duodecimal | (noun) one part in twelve equal parts | Synonyms: one-twelfth, twelfth, twelfth part |
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| duodenum | (noun) the part of the small intestine between the stomach and the jejunum | - |
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| duodiode | (noun) an electron tube having two diodes in the same envelope, with either a common cathode or separate cathodes. | - |
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| duologue | (noun) a part of the script in which the speaking roles are limited to two actors | - |
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| (noun) a conversation between two persons | Synonyms: dialog, dialogue |
| duomo | (noun) the principal Christian church building of a bishop's diocese | Synonyms: cathedral |
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| fatuousness | (noun) a ludicrous folly | Synonyms: absurdity, fatuity, silliness |
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| 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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| gluon | (noun) a gauge boson that mediates strong interaction among quarks | - |
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| hydrochlorofluorocarbon | (noun) a fluorocarbon that is replacing chlorofluorocarbon as a refrigerant and propellant in aerosol cans; considered to be somewhat less destructive to the atmosphere | Synonyms: HCFC |
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| hydrofluorocarbon | (noun) a fluorocarbon emitted as a by-product of industrial manufacturing | Synonyms: HFC |
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| immunofluorescence | (noun) (immunology) a technique that uses antibodies linked to a fluorescent dye in order to study antigens in a sample of tissue | - |
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| impetuosity | (noun) rash impulsiveness | Synonyms: impetuousness |
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| impetuousness | (noun) rash impulsiveness | Synonyms: impetuosity |
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| incongruousness | (noun) the quality of disagreeing; being unsuitable and inappropriate | Synonyms: incongruity |
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| inconspicuousness | (noun) the quality of being not easily seen | - |
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| ingenuousness | (noun) openly straightforward or frank | - |
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| (noun) the quality of innocent naivete | Synonyms: artlessness, innocence, naturalness |
| languor | (noun) inactivity; showing an unusual lack of energy | Synonyms: flatness, lethargy, phlegm, sluggishness |
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| (noun) a relaxed comfortable feeling | Synonyms: dreaminess |
| (noun) a feeling of lack of interest or energy | Synonyms: lassitude, listlessness |
| (noun) oppressively still air | - |
| liquor | (noun) an alcoholic beverage that is distilled rather than fermented | Synonyms: booze, hard drink, hard liquor, John Barleycorn, spirits, strong drink |
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| (noun) the liquid in which vegetables or meat have been cooked | Synonyms: pot likker, pot liquor |
| (noun) a liquid substance that is a solution (or emulsion or suspension) used or obtained in an industrial process | - |
| liquorice | (noun) a black candy flavored with the dried root of the licorice plant | Synonyms: licorice |
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| (noun) deep-rooted coarse-textured plant native to the Mediterranean region having blue flowers and pinnately compound leaves; widely cultivated in Europe for its long thick sweet roots | Synonyms: Glycyrrhiza glabra, licorice |
| metasequoia | (noun) large fast-growing Chinese monoecious tree having flat bright-green deciduous leaves and small globular cones; commonly cultivated in United States as an ornamental; known as a fossil before being discovered in China | Synonyms: dawn redwood, Metasequoia glyptostrodoides |
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| misquotation | (noun) an incorrect quotation | Synonyms: misquote |
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| misquote | (noun) an incorrect quotation | Synonyms: misquotation |
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| muon | (noun) an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino | Synonyms: mu-meson, negative muon |
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| perfluorocarbon | (noun) a powerful greenhouse gas emitted during the production of aluminum | Synonyms: PFC |
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| perspicuousness | (noun) clarity as a consequence of being perspicuous | Synonyms: perspicuity, plainness |
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| polytetrafluoroethylene | (noun) a material used to coat cooking utensils and in industrial applications where sticking is to be avoided | Synonyms: Teflon |
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| presumptuousness | (noun) audacious (even arrogant) behavior that you have no right to | Synonyms: assumption, effrontery, presumption |
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| promiscuousness | (noun) indulging in promiscuous (casual and indiscriminate) sexual relations | Synonyms: promiscuity, sleeping around |
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| quodlibet | (noun) an issue that is presented for formal disputation | - |
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| quoin | (noun) (architecture) solid exterior angle of a building; especially one formed by a cornerstone | Synonyms: corner |
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| (noun) the keystone of an arch | Synonyms: coign, coigne |
| (noun) expandable metal or wooden wedge used by printers to lock up a form within a chase | Synonyms: coign, coigne |
| quoit | (noun) game equipment consisting of a ring of iron or circle of rope used in playing the game of quoits | - |
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| quoits | (noun) a game in which iron rings (or open iron rings) are thrown at a stake in the ground in the hope of encircling it | Synonyms: horseshoes |
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| quorum | (noun) a gathering of the minimal number of members of an organization to conduct business | - |
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| quota | (noun) a limitation on imports | - |
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| (noun) a proportional share assigned to each participant | - |
| (noun) a prescribed number | - |
| quotability | (noun) the quality of being worthy of being quoted | - |
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| quotation | (noun) the practice of quoting from books or plays etc. | - |
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| (noun) a passage or expression that is quoted or cited | Synonyms: citation, quote |
| (noun) a short note recognizing a source of information or of a quoted passage | Synonyms: acknowledgment, citation, cite, credit, mention, reference |
| (noun) a statement of the current market price of a security or commodity | - |
| quote | (noun) a punctuation mark used to attribute the enclosed text to someone else | Synonyms: inverted comma, quotation mark |
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| (noun) a passage or expression that is quoted or cited | Synonyms: citation, quotation |
| quoter | (noun) a communicator (speaker or writer) who uses quotations | - |
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| quotient | (noun) the number obtained by division | - |
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| (noun) the ratio of two quantities to be divided | - |
| sensuousness | (noun) a sensuous feeling | - |
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| sequoia | (noun) either of two huge coniferous California trees that reach a height of 300 feet; sometimes placed in the Taxodiaceae | Synonyms: redwood |
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| (noun) wood of either of two huge coniferous California trees that reach a height of 300 feet; sometimes placed in the Taxodiaceae | Synonyms: redwood |
| sinuosity | (noun) having bends (especially of streams and roads) | Synonyms: sinuousness |
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| sinuousness | (noun) having bends (especially of streams and roads) | Synonyms: sinuosity |
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| strenuosity | (noun) intense energy | Synonyms: athleticism |
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| strenuousness | (noun) extreme effortfulness | Synonyms: arduousness |
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| sumptuosity | (noun) the quality possessed by something that is excessively expensive | Synonyms: lavishness, luxury, sumptuousness |
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| sumptuousness | (noun) the quality possessed by something that is excessively expensive | Synonyms: lavishness, luxury, sumptuosity |
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| (noun) wealth as evidenced by sumptuous living | Synonyms: luxuriousness, luxury, opulence |
| tauon | (noun) a lepton of very great mass | Synonyms: tau-minus particle |
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| tempestuousness | (noun) a state of wild storminess | - |
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| (noun) a state of agitation or turbulent change or development | Synonyms: agitation, ferment, fermentation, unrest |
| tetrafluoroethylene | (noun) a flammable gaseous fluorocarbon used in making plastics (polytetrafluoroethylene resins) | - |
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| tortuosity | (noun) a tortuous and twisted shape or position | Synonyms: contortion, crookedness, torsion, tortuousness |
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| tortuousness | (noun) puzzling complexity | Synonyms: complicatedness, complication, knottiness |
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| (noun) a tortuous and twisted shape or position | Synonyms: contortion, crookedness, torsion, tortuosity |
| trifluoromethane | (noun) colorless gas haloform CHF3 (similar to chloroform) | Synonyms: fluoroform |
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| tumultuousness | (noun) a state of commotion and noise and confusion | Synonyms: garboil, tumult, uproar |
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| turquoise | (noun) a shade of blue tinged with green | Synonyms: aqua, aquamarine, cobalt blue, greenish blue, peacock blue |
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| (noun) a blue to grey green mineral consisting of copper aluminum phosphate | - |
| unctuousness | (noun) smug self-serving earnestness | Synonyms: fulsomeness, oiliness, oleaginousness, smarminess, unction |
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| vacuolation | (noun) the state of having become filled with vacuoles | Synonyms: vacuolisation, vacuolization |
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| vacuole | (noun) a tiny cavity filled with fluid in the cytoplasm of a cell | - |
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| vacuolisation | (noun) the state of having become filled with vacuoles | Synonyms: vacuolation, vacuolization |
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| vacuolization | (noun) the state of having become filled with vacuoles | Synonyms: vacuolation, vacuolisation |
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| vacuousness | (noun) indicative of or marked by mental vacuity and an absence of ideas | - |
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