| flab | (noun) loose or flaccid body fat | - |
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| flabbiness | (noun) a flabby softness | Synonyms: flaccidity, limpness |
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| flaccidity | (noun) a flabby softness | Synonyms: flabbiness, limpness |
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| flack | (noun) artillery designed to shoot upward at airplanes | Synonyms: ack-ack, ack-ack gun, antiaircraft, antiaircraft gun, flak, pom-pom |
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| (noun) intense adverse criticism | Synonyms: attack, blast, fire, flak |
| (noun) a slick spokesperson who can turn any criticism to the advantage of their employer | Synonyms: flack catcher, flak, flak catcher |
| flag | (noun) a conspicuously marked or shaped tail | - |
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| (noun) emblem usually consisting of a rectangular piece of cloth of distinctive design | - |
| (noun) stratified stone that splits into pieces suitable as paving stones | Synonyms: flagstone |
| (noun) flagpole used to mark the position of the hole on a golf green | Synonyms: pin |
| (noun) a rectangular piece of fabric used as a signalling device | Synonyms: signal flag |
| (noun) a listing printed in all issues of a newspaper or magazine (usually on the editorial page) that gives the name of the publication and the names of the editorial staff, etc. | Synonyms: masthead |
| (noun) plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals | Synonyms: fleur-de-lis, iris, sword lily |
| flagellant | (noun) a person who whips himself as a religious penance | - |
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| (noun) a person who is whipped or whips himself for sexual gratification | - |
| flagellate | (noun) a usually nonphotosynthetic free-living protozoan with whiplike appendages; some are pathogens of humans and other animals | Synonyms: flagellate protozoan, flagellated protozoan, mastigophoran, mastigophore |
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| flagellation | (noun) beating with a whip or strap or rope as a form of punishment | Synonyms: flogging, lashing, tanning, whipping |
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| (noun) beating as a source of erotic or religious stimulation | - |
| flagellum | (noun) a lash-like appendage used for locomotion (e.g., in sperm cells and some bacteria and protozoa) | - |
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| (noun) a whip used to inflict punishment | Synonyms: scourge |
| flageolet | (noun) a small fipple flute with four finger holes and two thumb holes | Synonyms: shepherd's pipe, treble recorder |
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| (noun) a French bean variety with light-colored seeds; usually dried | Synonyms: haricot |
| flagfish | (noun) a fish with a dark-blue back and whitish sides with red stripes; found in swamps and streams of Florida | Synonyms: American flagfish, Jordanella floridae |
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| flagging | (noun) a walk of flagstones | - |
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| (noun) flagstones collectively | - |
| flagon | (noun) a large metal or pottery vessel with a handle and spout; used to hold alcoholic beverages (usually wine) | - |
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| flagpole | (noun) a tall staff or pole on which a flag is raised | Synonyms: flagstaff |
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| (noun) surveying instrument consisting of a straight rod painted in bands of alternate red and white each one foot wide; used for sightings by surveyors | Synonyms: range pole, ranging pole |
| flagroot | (noun) perennial marsh plant having swordlike leaves and aromatic roots | Synonyms: Acorus calamus, calamus, myrtle flag, sweet calamus, sweet flag |
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| flagship | (noun) the ship that carries the commander of a fleet and flies his flag | - |
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| (noun) the chief one of a related group | - |
| flagstaff | (noun) a tall staff or pole on which a flag is raised | Synonyms: flagpole |
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| flagstone | (noun) stratified stone that splits into pieces suitable as paving stones | Synonyms: flag |
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| flail | (noun) an implement consisting of handle with a free swinging stick at the end; used in manual threshing | - |
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| flair | (noun) distinctive and stylish elegance | Synonyms: dash, elan, panache, style |
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| (noun) a natural talent | Synonyms: genius |
| (noun) a shape that spreads outward | Synonyms: flare |
| flak | (noun) artillery designed to shoot upward at airplanes | Synonyms: ack-ack, ack-ack gun, antiaircraft, antiaircraft gun, flack, pom-pom |
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| (noun) intense adverse criticism | Synonyms: attack, blast, fire, flack |
| (noun) a slick spokesperson who can turn any criticism to the advantage of their employer | Synonyms: flack, flack catcher, flak catcher |
| flake | (noun) a small fragment of something broken off from the whole | Synonyms: bit, chip, fleck, scrap |
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| (noun) a person with an unusual or odd personality | Synonyms: eccentric, eccentric person, geek, oddball |
| (noun) a crystal of snow | Synonyms: snowflake |
| flakiness | (noun) having or breaking into thin crisp flakes | - |
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| (noun) informal terms for insanity | Synonyms: craziness, daftness |
| flambeau | (noun) a flaming torch (such as are used in processions at night) | - |
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| flamboyance | (noun) extravagant elaborateness | Synonyms: floridity, floridness, showiness |
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| flamboyant | (noun) showy tropical tree or shrub native to Madagascar; widely planted in tropical regions for its immense racemes of scarlet and orange flowers; sometimes placed in genus Poinciana | Synonyms: Delonix regia, flame tree, peacock flower, Poinciana regia, royal poinciana |
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| flame | (noun) the process of combustion of inflammable materials producing heat and light and (often) smoke | Synonyms: fire, flaming |
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| flamefish | (noun) a cardinalfish found in tropical Atlantic coastal waters | Synonyms: Apogon maculatus, flame fish |
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| flameflower | (noun) plant with fleshy roots and erect stems with narrow succulent leaves and one reddish-orange flower in each upper leaf axil; southwestern United States; Indians once cooked the fleshy roots | Synonyms: flame-flower, flame flower, Talinum aurantiacum |
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| (noun) a plant of the genus Kniphofia having long grasslike leaves and tall scapes of red or yellow drooping flowers | Synonyms: flame-flower, flame flower, kniphofia, tritoma |
| flamen | (noun) a priest who served a particular deity in ancient Rome | - |
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| flamenco | (noun) a style of dancing characteristic of the Andalusian Gypsies; vigorous and rhythmic with clapping and stamping of feet | Synonyms: gypsy dancing |
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| (noun) guitar music composed for dancing the flamenco | - |
| flamethrower | (noun) a weapon that squirts ignited fuel for several yards | - |
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| flaming | (noun) the process of combustion of inflammable materials producing heat and light and (often) smoke | Synonyms: fire, flame |
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| flamingo | (noun) large pink to scarlet web-footed wading bird with down-bent bill; inhabits brackish lakes | - |
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| flammability | (noun) the quality of being easily ignited and burning rapidly | Synonyms: inflammability |
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| flan | (noun) open pastry filled with fruit or custard | - |
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| flange | (noun) a projection used for strength or for attaching to another object | Synonyms: rim |
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| flank | (noun) the side between ribs and hipbone | - |
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| (noun) a cut from the fleshy part of an animal's side between the ribs and the leg | - |
| (noun) the side of military or naval formation | Synonyms: wing |
| (noun) a subfigure consisting of a side of something | - |
| flanker | (noun) a soldier who is a member of a detachment assigned to guard the flanks of a military formation | - |
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| (noun) a back stationed wide of the scrimmage line; used as a pass receiver | Synonyms: flanker back |
| flannel | (noun) a soft light woolen fabric; used for clothing | - |
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| (noun) bath linen consisting of a piece of cloth used to wash the face and body | Synonyms: face cloth, washcloth, washrag |
| (noun) (usually in the plural) trousers made of flannel or gabardine or tweed or white cloth | Synonyms: gabardine, tweed, white |
| flannelbush | (noun) any of several handsome evergreen shrubs of California and northern Mexico having downy lobed leaves and showy yellow flowers | Synonyms: California beauty, flannel bush |
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| flannelette | (noun) a cotton fabric imitating flannel | - |
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| flap | (noun) any broad thin and limber covering attached at one edge; hangs loose or projects freely | - |
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| (noun) a movable airfoil that is part of an aircraft wing; used to increase lift or drag | Synonyms: flaps |
| (noun) a movable piece of tissue partly connected to the body | - |
| (noun) the motion made by flapping up and down | Synonyms: flapping, flutter, fluttering |
| (noun) an excited state of agitation | Synonyms: dither, fuss, pother, tizzy |
| flapcake | (noun) a flat cake of thin batter fried on both sides on a griddle | Synonyms: battercake, flannel-cake, flannel cake, flapjack, griddlecake, hot cake, hotcake, pancake |
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| flapjack | (noun) a flat cake of thin batter fried on both sides on a griddle | Synonyms: battercake, flannel-cake, flannel cake, flapcake, griddlecake, hot cake, hotcake, pancake |
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| flapper | (noun) a young woman in the 1920s who flaunted her unconventional conduct and dress | - |
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| flapping | (noun) the motion made by flapping up and down | Synonyms: flap, flutter, fluttering |
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| flaps | (noun) a movable airfoil that is part of an aircraft wing; used to increase lift or drag | Synonyms: flap |
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| flare | (noun) (baseball) a fly ball hit a short distance into the outfield | - |
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| (noun) a short forward pass to a back who is running toward the sidelines | Synonyms: flare pass |
| (noun) a device that produces a bright light for warning or illumination or identification | - |
| (noun) a burst of light used to communicate or illuminate | Synonyms: flash |
| (noun) a sudden outburst of emotion | - |
| (noun) a sudden eruption of intense high-energy radiation from the sun's surface; associated with sunspots and radio interference | Synonyms: solar flare |
| (noun) an unwanted reflection in an optical system (or the fogging of an image that is caused by such a reflection) | - |
| (noun) a sudden burst of flame | - |
| (noun) a shape that spreads outward | Synonyms: flair |
| (noun) reddening of the skin spreading outward from a focus of infection or irritation | - |
| (noun) a sudden recurrence or worsening of symptoms | - |
| flash | (noun) a lamp for providing momentary light to take a photograph | Synonyms: flash bulb, flash lamp, flashbulb, flashgun, photoflash |
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| (noun) a bright patch of color used for decoration or identification | - |
| (noun) a momentary brightness | - |
| (noun) a sudden brilliant understanding | - |
| (noun) a short news announcement concerning some on-going news story | Synonyms: news bulletin, newsbreak, newsflash |
| (noun) a burst of light used to communicate or illuminate | Synonyms: flare |
| (noun) a gaudy outward display | Synonyms: fanfare, ostentation |
| (noun) a sudden intense burst of radiant energy | - |
| (noun) a short vivid experience | Synonyms: flashing |
| (noun) a very short time (as the time it takes the eye to blink or the heart to beat) | Synonyms: blink of an eye, heartbeat, instant, jiffy, New York minute, split second, trice, twinkling, wink |
| flashback | (noun) a transition (in literary or theatrical works or films) to an earlier event or scene that interrupts the normal chronological development of the story | - |
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| (noun) an unexpected but vivid recurrence of a past experience (especially a recurrence of the effects of an hallucinogenic drug taken much earlier) | - |
| flashboard | (noun) boarding place along the top of a dam to increase its height | Synonyms: flashboarding |
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| flashboarding | (noun) boarding place along the top of a dam to increase its height | Synonyms: flashboard |
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| flashbulb | (noun) a lamp for providing momentary light to take a photograph | Synonyms: flash, flash bulb, flash lamp, flashgun, photoflash |
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| flashcard | (noun) a card with words or numbers or pictures that is flashed to a class by the teacher | Synonyms: flash card |
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| flasher | (noun) an electrical device that automatically turns a lamp on and off (as for an advertising display) | - |
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| (noun) a light that flashes on and off; used as a signal or to send messages | Synonyms: blinker |
| (noun) someone with a compulsive desire to expose the genitals | Synonyms: exhibitionist |
| flashflood | (noun) a sudden local flood of great volume and short duration | Synonyms: flash flood |
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| flashgun | (noun) a lamp for providing momentary light to take a photograph | Synonyms: flash, flash bulb, flash lamp, flashbulb, photoflash |
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| flashiness | (noun) tasteless showiness | Synonyms: brashness, garishness, gaudiness, glitz, loudness, meretriciousness, tawdriness |
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| flashing | (noun) sheet metal shaped and attached to a roof for strength and weatherproofing | - |
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| (noun) a short vivid experience | Synonyms: flash |
| flashlight | (noun) a small portable battery-powered electric lamp | Synonyms: torch |
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| flashover | (noun) an unintended electric discharge (as over or around an insulator) | - |
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| flashpoint | (noun) the lowest temperature at which the vapor of a combustible liquid can be ignited in air | Synonyms: flash point |
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| (noun) a place of political unrest and potential violence | Synonyms: hot spot, hotspot, trouble spot |
| (noun) point at which something is ready to blow up | Synonyms: flash point |
| flask | (noun) bottle that has a narrow neck | - |
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| (noun) the quantity a flask will hold | Synonyms: flaskful |
| flaskful | (noun) the quantity a flask will hold | Synonyms: flask |
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| flat | (noun) a suite of rooms usually on one floor of an apartment house | Synonyms: apartment |
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| (noun) scenery consisting of a wooden frame covered with painted canvas; part of a stage setting | - |
| (noun) a deflated pneumatic tire | Synonyms: flat tire |
| (noun) freight car without permanent sides or roof | Synonyms: flatbed, flatcar |
| (noun) a shallow box in which seedlings are started | - |
| (noun) a musical notation indicating one half step lower than the note named | - |
| (noun) a level tract of land | - |
| flatbed | (noun) an open truck bed or trailer with no sides; used to carry large heavy objects | - |
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| (noun) freight car without permanent sides or roof | Synonyms: flat, flatcar |
| flatboat | (noun) a flatbottom boat for carrying heavy loads (especially on canals) | Synonyms: barge, hoy, lighter |
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| flatbread | (noun) any of various breads made from usually unleavened dough | - |
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| flatbrod | (noun) the thin wafer-like bread of Scandinavia | - |
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| flatcar | (noun) freight car without permanent sides or roof | Synonyms: flat, flatbed |
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| flatfish | (noun) any of several families of fishes having flattened bodies that swim along the sea floor on one side of the body with both eyes on the upper side | - |
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| (noun) sweet lean whitish flesh of any of numerous thin-bodied fish; usually served as thin fillets | - |
| flatfoot | (noun) a foot afflicted with a fallen arch; abnormally flattened and spread out | Synonyms: pes planus, splayfoot |
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| (noun) a policeman who patrols a given region | Synonyms: patrolman |
| flathead | (noun) food fish of the Indonesian region of the Pacific; resembles gurnards | - |
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| (noun) pallid bottom-dwelling flat-headed fish with large eyes and a duck-like snout | - |
| flatiron | (noun) an iron that was heated by placing it on a stove | - |
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| flatlet | (noun) a tiny flat | - |
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| flatmate | (noun) an associate who shares an apartment with you | - |
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| flatness | (noun) the property of having two dimensions | Synonyms: planeness, two-dimensionality |
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| (noun) inactivity; showing an unusual lack of energy | Synonyms: languor, lethargy, phlegm, sluggishness |
| (noun) the property of having little or no contrast; lacking highlights or gloss | Synonyms: lusterlessness, lustrelessness, mat, matt, matte |
| (noun) a deficiency in flavor | - |
| (noun) a want of animation or brilliance | - |
| flats | (noun) footwear (shoes or slippers) with no heel (or a very low heel) | - |
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| flatterer | (noun) a person who uses flattery | Synonyms: adulator |
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| flattery | (noun) excessive or insincere praise | - |
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| flattop | (noun) a large warship that carries planes and has a long flat deck for takeoffs and landings | Synonyms: aircraft carrier, attack aircraft carrier, carrier |
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| (noun) a closely cropped haircut; usually for men or boys | Synonyms: butch, crew cut |
| flatulence | (noun) pompously embellished language | Synonyms: turgidity, turgidness |
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| (noun) a state of excessive gas in the alimentary canal | Synonyms: flatulency, gas |
| flatulency | (noun) a state of excessive gas in the alimentary canal | Synonyms: flatulence, gas |
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| flatus | (noun) a reflex that expels intestinal gas through the anus | Synonyms: breaking wind, fart, farting, wind |
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| flatware | (noun) silverware eating utensils | Synonyms: silver |
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| (noun) tableware that is relatively flat and fashioned as a single piece | - |
| flatwork | (noun) ironing that can be done mechanically | Synonyms: flat wash |
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| flatworm | (noun) parasitic or free-living worms having a flattened body | Synonyms: platyhelminth |
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| flaunt | (noun) the act of displaying something ostentatiously | - |
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| flautist | (noun) someone who plays the flute | Synonyms: flute player, flutist |
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| flavin | (noun) a ketone that forms the nucleus of certain natural yellow pigments like riboflavin | - |
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| flavivirus | (noun) animal viruses belonging to the family Flaviviridae | - |
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| flavone | (noun) a colorless crystalline compound that is part of a number of white or yellow plant pigments | - |
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| flavonoid | (noun) any of a large class of plant pigments having a chemical structure based on or similar to flavone | - |
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| flavor | (noun) the taste experience when a savoury condiment is taken into the mouth | Synonyms: flavour, nip, relish, sapidity, savor, savour, smack, tang |
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| (noun) (physics) the six kinds of quarks | Synonyms: flavour |
| (noun) the general atmosphere of a place or situation and the effect that it has on people | Synonyms: feel, feeling, flavour, look, smell, spirit, tone |
| flavorer | (noun) something added to food primarily for the savor it imparts | Synonyms: flavoring, flavourer, flavouring, seasoner, seasoning |
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| flavoring | (noun) something added to food primarily for the savor it imparts | Synonyms: flavorer, flavourer, flavouring, seasoner, seasoning |
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| flavorlessness | (noun) the property of having no flavor | Synonyms: flavourlessness, savorlessness, savourlessness, tastelessness |
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| flavorsomeness | (noun) having an appetizing flavor | Synonyms: flavoursomeness, savoriness |
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| flavour | (noun) the taste experience when a savoury condiment is taken into the mouth | Synonyms: flavor, nip, relish, sapidity, savor, savour, smack, tang |
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| (noun) (physics) the six kinds of quarks | Synonyms: flavor |
| (noun) the general atmosphere of a place or situation and the effect that it has on people | Synonyms: feel, feeling, flavor, look, smell, spirit, tone |