| afflatus | (noun) a strong creative impulse; divine inspiration | - |
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| aflame | (adjective) lighted up by or as by fire or flame | Synonyms: ablaze, afire, aflare, alight, on fire |
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| (adjective) keenly excited (especially sexually) or indicating excitement | Synonyms: ablaze, aroused |
| aflare | (adjective) lighted up by or as by fire or flame | Synonyms: ablaze, afire, aflame, alight, on fire |
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| (adjective) streaming or flapping or spreading wide as if in a current of air | Synonyms: flaring |
| aflatoxin | (noun) a potent carcinogen from the fungus Aspergillus; can be produced and stored for use as a bioweapon | - |
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| antiflatulent | (noun) any agent that reduces intestinal gas | - |
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| biflagellate | (adjective) having two flagella | - |
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| bioflavinoid | (noun) a vitamin that maintains the resistance of cell and capillary walls to permeation | Synonyms: citrin, vitamin P |
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| camouflage | (noun) the act of concealing the identity of something by modifying its appearance | Synonyms: disguise |
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| (noun) device or stratagem for concealment or deceit | - |
| (noun) fabric dyed with splotches of green and brown and black and tan; intended to make the wearer of a garment made of this fabric hard to distinguish from the background | Synonyms: camo |
| (noun) an outward semblance that misrepresents the true nature of something | Synonyms: disguise |
| (verb) disguise by camouflaging; exploit the natural surroundings to disguise something | - |
| camouflaged | (adjective) made invisible by means of protective coloring | - |
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| conflagrate | (verb) start to burn or burst into flames | Synonyms: catch fire, combust, erupt, ignite, take fire |
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| (verb) cause to start burning | Synonyms: enkindle, inflame, kindle |
| conflagration | (noun) a very intense and uncontrolled fire | Synonyms: inferno |
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| conflate | (verb) mix together different elements | Synonyms: blend, coalesce, combine, commingle, flux, fuse, immix, meld, merge, mix |
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| deflagrate | (verb) burn with great heat and intense light | - |
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| (verb) cause to burn rapidly and with great intensity | - |
| deflagration | (noun) combustion that propagates through a gas or along the surface of an explosive at a rapid rate driven by the transfer of heat | - |
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| deflate | (verb) become deflated or flaccid, as by losing air | - |
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| (verb) reduce or cut back the amount or availability of, creating a decline in value or prices | - |
| (verb) produce deflation in | - |
| (verb) reduce or lessen the size or importance of | Synonyms: puncture |
| (verb) release contained air or gas from | - |
| (verb) collapse by releasing contained air or gas | - |
| deflated | (adjective) brought low in spirit | Synonyms: chapfallen, chopfallen, crestfallen |
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| deflation | (noun) the act of letting the air out of something | - |
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| (noun) a contraction of economic activity resulting in a decline of prices | - |
| (noun) (geology) the erosion of soil as a consequence of sand and dust and loose rocks being removed by the wind | - |
| deflationary | (adjective) associated with or tending to cause decreases in consumer prices or increases in the purchasing power of money | - |
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| deflator | (noun) a statistical factor designed to remove the effect of inflation; inflation adjusted variables are in constant dollars | - |
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| dinoflagellate | (noun) chiefly marine protozoa having two flagella; a chief constituent of plankton | - |
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| disinflation | (noun) a reduction of prices intended to improve the balance of payments | - |
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| earflap | (noun) one of two flaps attached to a cap to keep the ears warm | Synonyms: earlap |
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| flab | (noun) loose or flaccid body fat | - |
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| flabbergast | (verb) overcome with amazement | Synonyms: boggle, bowl over |
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| flabbergasted | (adjective) as if struck dumb with astonishment and surprise | Synonyms: dumbfounded, dumbstricken, dumbstruck, dumfounded, stupefied, thunderstruck |
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| flabbily | (adverb) in a flabby manner | - |
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| flabbiness | (noun) a flabby softness | Synonyms: flaccidity, limpness |
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| flabby | (adjective) out of condition; not strong or robust; incapable of exertion or endurance | Synonyms: flaccid, soft |
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| flaccid | (adjective) drooping without elasticity; wanting in stiffness | - |
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| (adjective) out of condition; not strong or robust; incapable of exertion or endurance | Synonyms: flabby, soft |
| 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 |
| (verb) provide with a flag | - |
| (verb) become less intense | Synonyms: ease off, ease up, slacken off |
| (verb) communicate or signal with a flag | - |
| (verb) decorate with flags | - |
| (verb) droop, sink, or settle from or as if from pressure or loss of tautness | Synonyms: droop, sag, swag |
| 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 | (adjective) having or resembling a lash or whip (as does a flagellum) | Synonyms: flagellated, lash-like, whiplike |
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| (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 |
| (verb) whip | Synonyms: scourge |
| flagellated | (adjective) having or resembling a lash or whip (as does a flagellum) | Synonyms: flagellate, lash-like, whiplike |
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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 | (adjective) weak from exhaustion | Synonyms: drooping |
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| (noun) a walk of flagstones | - |
| (noun) flagstones collectively | - |
| flagitious | (adjective) shockingly brutal or cruel | Synonyms: atrocious, grievous, monstrous |
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| (adjective) extremely wicked, deeply criminal | Synonyms: heinous |
| 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 |
| flagrant | (adjective) conspicuously and outrageously bad or reprehensible | Synonyms: crying, egregious, glaring, gross, rank |
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| flagrantly | (adverb) in a flagrant manner | - |
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| 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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| (verb) give a thrashing to; beat hard | Synonyms: lam, thrash, thresh |
| (verb) move like a flail; thresh about | Synonyms: thresh |
| 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 |
| (verb) come off in flakes or thin small pieces | Synonyms: flake off, peel, peel off |
| (verb) cover with flakes or as if with flakes | - |
| (verb) form into flakes | - |
| flakey | (adjective) made of or resembling flakes | Synonyms: flaky |
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| (adjective) made of or easily forming flakes | Synonyms: flaky |
| (adjective) conspicuously or grossly unconventional or unusual | Synonyms: bizarre, eccentric, flaky, freakish, freaky, gonzo, off-the-wall, outlandish, outre |
| flakiness | (noun) having or breaking into thin crisp flakes | - |
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| (noun) informal terms for insanity | Synonyms: craziness, daftness |
| flaky | (adjective) made of or resembling flakes | Synonyms: flakey |
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| (adjective) made of or easily forming flakes | Synonyms: flakey |
| (adjective) conspicuously or grossly unconventional or unusual | Synonyms: bizarre, eccentric, flakey, freakish, freaky, gonzo, off-the-wall, outlandish, outre |
| flambe | (verb) pour liquor over and ignite (a dish) | - |
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| 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 | (adjective) elaborately or excessively ornamented | Synonyms: aureate, florid |
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| (adjective) marked by ostentation but often tasteless | Synonyms: showy, splashy |
| (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 |
| flamboyantly | (adverb) in a fancy colorful manner | Synonyms: flashily, showily |
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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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| (verb) criticize harshly, usually via an electronic medium | - |
| (verb) be in flames or aflame | - |
| (verb) shine with a sudden light | Synonyms: flare |
| 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 | - |
| flameproof | (adjective) resistant to catching fire | Synonyms: flame-retardant |
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| flamethrower | (noun) a weapon that squirts ignited fuel for several yards | - |
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| flaming | (adjective) passionate or quick-tempered | Synonyms: fiery |
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| (adjective) informal intensifiers | Synonyms: bally, blinking, bloody, blooming, crashing, fucking |
| (noun) the process of combustion of inflammable materials producing heat and light and (often) smoke | Synonyms: fire, flame |
| 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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| flammable | (adjective) easily ignited | Synonyms: inflammable |
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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 | - |
| (verb) be located at the sides of something or somebody | - |
| 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 |
| (verb) pronounce with a flap, of alveolar sounds | - |
| (verb) make a fuss; be agitated | Synonyms: dither, pother |
| (verb) to flutter noisily when moved by the wind | - |
| (verb) move in a wavy pattern or with a rising and falling motion | Synonyms: roll, undulate, wave |
| (verb) move with a flapping motion | Synonyms: beat |
| (verb) move with a thrashing motion | Synonyms: beat |
| 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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| flappy | (adjective) having a tendency to flap | - |
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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 | - |
| (verb) become flared and widen, usually at one end | Synonyms: flare out |
| (verb) erupt or intensify suddenly | Synonyms: break open, burst out, erupt, flare up, irrupt |
| (verb) burn brightly | Synonyms: blaze up, burn up, flame up |
| (verb) shine with a sudden light | Synonyms: flame |
| flaring | (adjective) streaming or flapping or spreading wide as if in a current of air | Synonyms: aflare |
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| flash | (adjective) tastelessly showy | Synonyms: brassy, cheap, flashy, garish, gaudy, gimcrack, loud, meretricious, tacky, tatty, tawdry, trashy |
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| (noun) a lamp for providing momentary light to take a photograph | Synonyms: flash bulb, flash lamp, flashbulb, flashgun, photoflash |
| (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 |
| (verb) appear briefly | - |
| (verb) emit a brief burst of light | - |
| (verb) make known or cause to appear with great speed | - |
| (verb) protect by covering with a thin sheet of metal | - |
| (verb) run or move very quickly or hastily | Synonyms: dart, dash, scoot, scud, shoot |
| (verb) gleam or glow intermittently | Synonyms: blink, twinkle, wink, winkle |
| (verb) display proudly; act ostentatiously or pretentiously | Synonyms: flaunt, ostentate, show off, swank |
| (verb) expose or show briefly | - |
| 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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| flashily | (adverb) in a fancy colorful manner | Synonyms: flamboyantly, showily |
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| (adverb) in a meretricious manner | Synonyms: meretriciously |
| 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 |