| flea | (noun) any wingless bloodsucking parasitic insect noted for ability to leap | - |
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| fleabag | (noun) a run-down hotel | - |
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| fleabane | (noun) hairy perennial Eurasian herb with yellow daisylike flowers reputed to destroy or drive away fleas | Synonyms: feabane mullet, Pulicaria dysenterica |
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| (noun) any of several North American plants of the genus Erigeron having daisylike flowers; formerly believed to repel fleas | - |
| (noun) common North American weed with linear leaves and small discoid heads of yellowish flowers; widely naturalized throughout temperate regions; sometimes placed in genus Erigeron | Synonyms: Canadian fleabane, Conyza canadensis, Erigeron canadensis, horseweed |
| fleapit | (noun) an old shabby movie theater | - |
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| fleawort | (noun) plantain of Mediterranean regions whose seeds swell and become gelatinous when moist and are used as a mild laxative | Synonyms: Plantago psyllium, psyllium, Spanish psyllium |
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| flecainide | (noun) oral antiarrhythmic medication (trade name Tambocor) used as a last resort in treating arrhythmias; increases the risk of sudden death in heart attack patients | Synonyms: Tambocor |
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| fleck | (noun) a small contrasting part of something | Synonyms: dapple, maculation, patch, speckle, spot |
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| (noun) a small fragment of something broken off from the whole | Synonyms: bit, chip, flake, scrap |
| (verb) make a spot or mark onto | Synonyms: blob, blot, spot |
| flecked | (adjective) having a pattern of dots | Synonyms: dotted, specked, speckled, stippled |
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| flection | (noun) deviation from a straight or normal course | Synonyms: flexion, inflection |
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| (noun) the state of being flexed (as of a joint) | Synonyms: flexion, flexure |
| fledge | (verb) grow feathers | Synonyms: feather |
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| (verb) decorate with feathers | Synonyms: flight |
| (verb) feed, care for, and rear young birds for flight | - |
| fledged | (adjective) (of birds) having developed feathers or plumage; often used in combination | Synonyms: mature |
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| (adjective) (of an arrow) equipped with feathers | Synonyms: vaned |
| fledgeless | (adjective) (of an arrow) not equipped with feathers | Synonyms: unfledged, unvaned |
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| fledgeling | (adjective) (of a young bird) having acquired its flight feathers | Synonyms: fledgling |
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| (noun) young bird that has just fledged or become capable of flying | Synonyms: fledgling |
| (noun) any new participant in some activity | Synonyms: entrant, fledgling, freshman, neophyte, newbie, newcomer, starter |
| fledgling | (adjective) (of a young bird) having acquired its flight feathers | Synonyms: fledgeling |
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| (adjective) young and inexperienced | Synonyms: callow, unfledged |
| (noun) young bird that has just fledged or become capable of flying | Synonyms: fledgeling |
| (noun) any new participant in some activity | Synonyms: entrant, fledgeling, freshman, neophyte, newbie, newcomer, starter |
| flee | (verb) run away quickly | Synonyms: fly, take flight |
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| fleece | (noun) outer coat of especially sheep and yaks | Synonyms: wool |
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| (noun) a soft bulky fabric with deep pile; used chiefly for clothing | - |
| (noun) the wool of a sheep or similar animal | - |
| (noun) tanned skin of a sheep with the fleece left on; used for clothing | Synonyms: sheepskin |
| (verb) shear the wool from | Synonyms: shear |
| (verb) rip off; ask an unreasonable price | Synonyms: gazump, hook, overcharge, pluck, plume, rob, soak, surcharge |
| fleeceable | (adjective) naive and easily deceived or tricked | Synonyms: green, gullible |
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| fleecy | (adjective) (of fabrics) having soft nap produced by brushing | Synonyms: brushed, napped |
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| fleer | (noun) someone who flees from an uncongenial situation | Synonyms: fugitive, runaway |
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| (noun) contempt expressed by mockery in looks or words | - |
| (verb) to smirk contemptuously | - |
| fleet | (adjective) moving very fast | Synonyms: swift |
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| (noun) a group of warships organized as a tactical unit | - |
| (noun) a group of steamships operating together under the same ownership | - |
| (noun) group of motor vehicles operating together under the same ownership | - |
| (noun) group of aircraft operating together under the same ownership | - |
| (verb) disappear gradually | Synonyms: blow over, evanesce, fade, pass, pass off |
| (verb) move along rapidly and lightly; skim or dart | Synonyms: dart, flit, flutter |
| fleeting | (adjective) lasting for a markedly brief time | Synonyms: fugitive, momentaneous, momentary |
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| fleetingness | (noun) the property of lasting for a very short time | Synonyms: ephemerality, ephemeralness |
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| fleetly | (adverb) in a swift manner | Synonyms: swiftly |
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| fleetness | (noun) rapidity of movement | - |
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| flense | (verb) strip the blubber or skin from (a whale or seal) | - |
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| flerovium | (noun) a radioactive transuranic element | Synonyms: Fl |
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| flesh | (noun) alternative names for the body of a human being | Synonyms: anatomy, bod, build, chassis, figure, form, frame, human body, material body, physical body, physique, shape, soma |
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| (noun) the soft tissue of the body of a vertebrate: mainly muscle tissue and fat | - |
| (noun) a soft moist part of a fruit | Synonyms: pulp |
| (verb) remove adhering flesh from (hides) when preparing leather manufacture | - |
| fleshiness | (noun) more than average fatness | Synonyms: corpulency, obesity |
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| fleshly | (adjective) marked by the appetites and passions of the body | Synonyms: animal, carnal, sensual |
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| fleshy | (adjective) of or relating to or resembling flesh | Synonyms: sarcoid |
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| (adjective) usually describes a large person who is fat but has a large frame to carry it | Synonyms: heavy, overweight |
| flews | (noun) The fleshy hanging upper lip of a bloodhound or similar dog. | - |
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| flex | (noun) the act of flexing | - |
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| (verb) cause (an object) to assume a crooked or angular form | Synonyms: bend, deform, turn, twist |
| (verb) bend a joint | Synonyms: bend |
| (verb) form a curve | Synonyms: bend |
| (verb) contract | - |
| (verb) exhibit the strength of | - |
| flexibility | (noun) the quality of being adaptable or variable | Synonyms: flexibleness |
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| (noun) the property of being flexible; easily bent or shaped | Synonyms: flexibleness |
| (noun) the trait of being easily persuaded | Synonyms: tractability, tractableness |
| flexible | (adjective) able to flex; able to bend easily | Synonyms: flexile |
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| (adjective) capable of being changed | - |
| (adjective) making or willing to make concessions | Synonyms: compromising, conciliatory |
| (adjective) able to adjust readily to different conditions | Synonyms: elastic, pliable, pliant |
| (adjective) bending and snapping back readily without breaking | Synonyms: whippy |
| flexibleness | (noun) the property of being flexible; easily bent or shaped | Synonyms: flexibility |
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| (noun) the quality of being adaptable or variable | Synonyms: flexibility |
| flexibly | (adverb) with flexibility | - |
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| flexile | (adjective) able to flex; able to bend easily | Synonyms: flexible |
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| flexion | (noun) act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased | Synonyms: flexure |
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| (noun) deviation from a straight or normal course | Synonyms: flection, inflection |
| (noun) the state of being flexed (as of a joint) | Synonyms: flection, flexure |
| flexitarianism | (noun) The practice of eating mainly vegetarian food, but making occasional exceptions for social, pragmatic, cultural, or nutritional reasons. | Synonyms: semi-vegetarianism |
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| flexor | (noun) a skeletal muscle whose contraction bends a joint | Synonyms: flexor muscle |
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| flexuous | (adjective) having turns or windings | - |
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| flexure | (noun) act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased | Synonyms: flexion |
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| (noun) an angular or rounded shape made by folding | Synonyms: bend, crease, crimp, fold, plication |
| (noun) the state of being flexed (as of a joint) | Synonyms: flection, flexion |