| bucktooth | (noun) a large projecting front tooth | - |
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| buckwheat | (noun) grain ground into flour | - |
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| (noun) a member of the genus Fagopyrum; annual Asian plant with clusters of small pinkish white flowers and small edible triangular seeds which are used whole or ground into flour | Synonyms: Fagopyrum esculentum, Polygonum fagopyrum |
| buckyball | (noun) a spheroidal fullerene; the first known example of a fullerene | Synonyms: buckminsterfullerene |
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| bucolic | (adjective) relating to shepherds or herdsmen or devoted to raising sheep or cattle | Synonyms: pastoral |
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| (adjective) (used with regard to idealized country life) idyllically rustic | Synonyms: arcadian, pastoral |
| (noun) a short poem descriptive of rural or pastoral life | Synonyms: eclogue, idyl, idyll |
| (noun) a country person | Synonyms: peasant, provincial |
| bud | (noun) a swelling on a plant stem consisting of overlapping immature leaves or petals | - |
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| (noun) a partially opened flower | - |
| (verb) develop buds | - |
| (verb) start to grow or develop | - |
| budding | (adjective) beginning to develop | - |
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| (noun) reproduction of some unicellular organisms (such as yeasts) by growth and specialization followed by the separation by constriction of a part of the parent | - |
| buddleia | (noun) tropical shrub having clusters of white or violet or yellow flowers | Synonyms: butterfly bush |
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| buddy | (noun) a close friend who accompanies his buddies in their activities | Synonyms: brother, chum, crony, pal, sidekick |
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| budge | (verb) move very slightly | Synonyms: agitate, shift, stir |
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| budgereegah | (noun) small Australian parakeet usually light green with black and yellow markings in the wild but bred in many colors | Synonyms: budgerigar, budgerygah, budgie, grass parakeet, lovebird, Melopsittacus undulatus, shell parakeet |
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| budgerigar | (noun) small Australian parakeet usually light green with black and yellow markings in the wild but bred in many colors | Synonyms: budgereegah, budgerygah, budgie, grass parakeet, lovebird, Melopsittacus undulatus, shell parakeet |
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| budgerygah | (noun) small Australian parakeet usually light green with black and yellow markings in the wild but bred in many colors | Synonyms: budgereegah, budgerigar, budgie, grass parakeet, lovebird, Melopsittacus undulatus, shell parakeet |
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| budget | (noun) a sum of money allocated for a particular purpose | - |
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| (noun) a summary of intended expenditures along with proposals for how to meet them | - |
| (verb) make a budget | - |
| budgetary | (adjective) of or relating to a budget | - |
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| budgie | (noun) small Australian parakeet usually light green with black and yellow markings in the wild but bred in many colors | Synonyms: budgereegah, budgerigar, budgerygah, grass parakeet, lovebird, Melopsittacus undulatus, shell parakeet |
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| buff | (adjective) of the yellowish-beige color of buff leather | - |
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| (noun) an implement consisting of soft material mounted on a block; used for polishing (as in manicuring) | Synonyms: buffer |
| (noun) a medium to dark tan color | Synonyms: caramel, caramel brown, raw sienna, yellowish brown |
| (noun) bare skin | - |
| (noun) an ardent follower and admirer | Synonyms: devotee, fan, lover |
| (noun) a soft thick undyed leather from the skins of e.g. buffalo or oxen | - |
| (verb) polish and make shiny | Synonyms: burnish, furbish |
| (verb) strike, beat repeatedly | Synonyms: buffet |
| buffalo | (noun) any of several Old World animals resembling oxen including, e.g., water buffalo, Cape buffalo | Synonyms: Old World buffalo |
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| (noun) large shaggy-haired brown bison of North American plains | Synonyms: American bison, American buffalo, Bison bison |
| (noun) meat from an American bison | - |
| (verb) intimidate or overawe | - |
| buffalofish | (noun) any of several large suckers of the Mississippi valley | Synonyms: buffalo fish |
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| (noun) large carp-like North American fish | - |
| buffer | (noun) a cushion-like device that reduces shock due to an impact | Synonyms: fender |
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| (noun) a power tool used to buff surfaces | Synonyms: polisher |
| (noun) an inclined metal frame at the front of a locomotive to clear the track | Synonyms: cowcatcher, fender, pilot |
| (noun) (computer science) a part of RAM used for temporary storage of data that is waiting to be sent to a device; used to compensate for differences in the rate of flow of data between components of a computer system | Synonyms: buffer storage, buffer store |
| (noun) an implement consisting of soft material mounted on a block; used for polishing (as in manicuring) | Synonyms: buff |
| (noun) a neutral zone between two rival powers that is created in order to diminish the danger of conflict | Synonyms: buffer zone |
| (noun) (chemistry) an ionic compound that resists changes in its pH | - |
| (verb) add a buffer (a solution) | - |
| (verb) protect from impact | Synonyms: cushion, soften |
| buffet | (noun) a piece of furniture that stands at the side of a dining room; has shelves and drawers | Synonyms: counter, sideboard |
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| (noun) usually inexpensive bar | Synonyms: snack bar, snack counter |
| (noun) a meal set out on a buffet at which guests help themselves | - |
| (verb) strike against forcefully | Synonyms: batter, knock about |
| (verb) strike, beat repeatedly | Synonyms: buff |
| buffeted | (adjective) pounded or hit repeatedly by storms or adversities | Synonyms: storm-tossed, tempest-swept, tempest-tossed, tempest-tost |
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| buffeting | (noun) repeated heavy blows | Synonyms: pounding |
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| bufflehead | (noun) small North American diving duck; males have bushy head plumage | Synonyms: Bucephela albeola, butterball, dipper |
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| buffoon | (noun) a person who amuses others by ridiculous behavior | Synonyms: clown, goof, goofball, merry andrew |
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| (noun) a rude or vulgar fool | Synonyms: clown |
| buffoonery | (noun) acting like a clown or buffoon | Synonyms: clowning, frivolity, harlequinade, japery, prank |
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| buffoonish | (adjective) like a clown | Synonyms: clownish, clownlike, zany |
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| bufo | (noun) any toad of the genus Bufo | - |
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| bug | (noun) insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis | Synonyms: hemipteran, hemipteron, hemipterous insect |
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| (noun) general term for any insect or similar creeping or crawling invertebrate | - |
| (noun) a minute life form (especially a disease-causing bacterium); the term is not in technical use | Synonyms: germ, microbe |
| (noun) a small hidden microphone; for listening secretly | - |
| (noun) a fault or defect in a computer program, system, or machine | Synonyms: glitch |
| (verb) annoy persistently | Synonyms: badger, beleaguer, pester, tease |
| (verb) tap a telephone or telegraph wire to get information | Synonyms: intercept, tap, wiretap |
| bugaboo | (noun) a source of concern | - |
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| (noun) an imaginary monster used to frighten children | Synonyms: bogeyman, booger, boogeyman, bugbear |
| bugbane | (noun) a plant of the genus Cimicifuga having flowers in long racemes or panicles reported to be distasteful to insects | - |
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| (noun) North American plant having large leaves and yellowish green flowers growing in racemes; yields a toxic alkaloid used medicinally | Synonyms: American hellebore, Indian poke, Veratrum viride, white hellebore |
| bugbear | (noun) an object of dread or apprehension | Synonyms: hobgoblin |
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| (noun) an imaginary monster used to frighten children | Synonyms: bogeyman, booger, boogeyman, bugaboo |
| bugged | (adjective) having hidden electronic eavesdropping devices | Synonyms: wired |
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| bugger | (noun) someone who engages in anal copulation (especially a male who engages in anal copulation with another male) | Synonyms: sod, sodomist, sodomite |
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| (verb) practice anal sex upon | Synonyms: sodomise, sodomize |
| buggery | (noun) intercourse via the anus, committed by a man with a man or woman | Synonyms: anal intercourse, anal sex, sodomy |
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| bugginess | (noun) the state of having bugs | - |
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| buggy | (adjective) infested with bugs | - |
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| (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, bats, batty, bonkers, cracked, crackers, daft, dotty, fruity, haywire, kookie, kooky, loco, loony, loopy, nuts, nutty, round the bend, wacky, whacky |
| (noun) a small lightweight carriage; drawn by a single horse | Synonyms: roadster |
| bugle | (noun) a brass instrument without valves; used for military calls and fanfares | - |
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| (noun) a tubular glass or plastic bead sewn onto clothing for decoration | - |
| (noun) any of various low-growing annual or perennial evergreen herbs native to Eurasia; used for ground cover | Synonyms: bugleweed |
| (verb) play on a bugle | - |
| bugler | (noun) someone who plays a bugle | - |
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| bugleweed | (noun) any of various low-growing annual or perennial evergreen herbs native to Eurasia; used for ground cover | Synonyms: bugle |
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| (noun) a mildly narcotic and astringent aromatic herb having small whitish flowers; eastern United States | Synonyms: Lycopus virginicus |
| bugloss | (noun) perennial or biennial herb cultivated for its delicate usually blue flowers | Synonyms: alkanet, Anchusa officinalis |
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| (noun) widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States | Synonyms: bitterweed, bristly oxtongue, oxtongue, Picris echioides |
| bugologist | (noun) a zoologist who studies insects | Synonyms: bug-hunter, entomologist |
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| bugology | (noun) the branch of zoology that studies insects | Synonyms: entomology |
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| buhl | (noun) an inlaid furniture decoration; tortoiseshell and yellow and white metal form scrolls in cabinetwork | Synonyms: boule, boulle |
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| build | (noun) constitution of the human body | Synonyms: body-build, habitus, physique |
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| (noun) alternative names for the body of a human being | Synonyms: anatomy, bod, chassis, figure, flesh, form, frame, human body, material body, physical body, physique, shape, soma |
| (verb) form or accumulate steadily | Synonyms: build up, progress, work up |
| (verb) improve the cleansing action of | - |
| (verb) bolster or strengthen | Synonyms: build up, ramp up, work up |
| (verb) develop and grow | - |
| (verb) found or ground | - |
| (verb) make by combining materials and parts | Synonyms: construct, make |
| (verb) give form to, according to a plan | - |
| (verb) build or establish something abstract | Synonyms: establish |
| (verb) be engaged in building | - |
| (verb) order, supervise, or finance the construction of | - |
| builder | (noun) someone who contracts for and supervises construction (as of a building) | Synonyms: constructor |
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| (noun) a person who creates a business or who organizes and develops a country | - |
| (noun) a substance added to soaps or detergents to increase their cleansing action | Synonyms: detergent builder |
| building | (noun) the act of constructing something | Synonyms: construction |
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| (noun) the commercial activity involved in repairing old structures or constructing new ones | Synonyms: construction |
| (noun) a structure that has a roof and walls and stands more or less permanently in one place | Synonyms: edifice |
| (noun) the occupants of a building | - |
| buildup | (noun) the act of building up an accumulation | - |
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| (noun) highly favorable publicity and praise | - |
| (noun) the result of the process of accumulation | - |
| built | (adjective) (used of soaps or cleaning agents) having a substance (an abrasive or filler) added to increase effectiveness | Synonyms: reinforced |
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| buirdly | (adjective) muscular and heavily built | Synonyms: beefy, burly, husky, strapping |
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| bulb | (noun) electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity | Synonyms: electric-light bulb, electric light, incandescent lamp, light bulb, lightbulb |
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| (noun) a rounded part of a cylindrical instrument (usually at one end) | - |
| (noun) a rounded dilation or expansion in a canal or vessel or organ | - |
| (noun) lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata) | Synonyms: medulla, medulla oblongata |
| (noun) a modified bud consisting of a thickened globular underground stem serving as a reproductive structure | - |
| (noun) anything with a round shape resembling a teardrop | - |
| bulbaceous | (adjective) producing or growing from bulbs | - |
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| bulbar | (adjective) involving the medulla oblongata | - |
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| bulbed | (adjective) having a bulb | - |
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| bulbil | (noun) small bulb or bulb-shaped growth arising from the leaf axil or in the place of flowers | Synonyms: bulblet |
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| bulblet | (noun) small bulb or bulb-shaped growth arising from the leaf axil or in the place of flowers | Synonyms: bulbil |
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| bulblike | (adjective) shaped like a bulb | Synonyms: bulb-shaped, bulbous |
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| bulbous | (adjective) curving outward | Synonyms: bellied, bellying, bulging, bulgy, protuberant |
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| (adjective) shaped like a bulb | Synonyms: bulb-shaped, bulblike |
| bulbul | (noun) nightingale spoken of in Persian poetry | - |
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| bulge | (noun) something that bulges out or is protuberant or projects from its surroundings | Synonyms: bump, excrescence, extrusion, gibbosity, gibbousness, hump, jut, prominence, protrusion, protuberance, swelling |
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| (verb) swell or protrude outwards | Synonyms: pouch, protrude |
| (verb) cause to bulge or swell outwards | Synonyms: bulk |
| (verb) bulge outward | Synonyms: bug out, bulge out, come out, pop, pop out, protrude, start |
| (verb) bulge out; form a bulge outward, or be so full as to appear to bulge | Synonyms: bag |
| bulghur | (noun) parched crushed wheat | Synonyms: bulgur, bulgur wheat |
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| bulginess | (noun) the property possessed by a rounded convexity | Synonyms: roundedness |
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| bulging | (adjective) curving or bulging outward | Synonyms: convex |
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| (adjective) curving outward | Synonyms: bellied, bellying, bulbous, bulgy, protuberant |
| bulgur | (noun) parched crushed wheat | Synonyms: bulghur, bulgur wheat |
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| bulgy | (adjective) curving outward | Synonyms: bellied, bellying, bulbous, bulging, protuberant |
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| bulimarexia | (noun) a disorder of eating in which the person alternates between strong craving for food and aversion to food; characterized by excessive eating followed by periods of fasting or self-induced vomiting | Synonyms: binge-purge syndrome, binge-vomit syndrome, bulimia nervosa |
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| bulimia | (noun) pathologically insatiable hunger (especially when caused by brain lesions) | - |
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| (noun) a disorder of eating seen among young women who go on eating binges and then feel guilt and depression and self-condemnation | Synonyms: binge-eating syndrome |
| bulimic | (adjective) suffering from bulimia | - |
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| (noun) a person suffering from bulimia | - |
| bulk | (noun) the property of something that is great in magnitude | Synonyms: mass, volume |
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| (noun) the property resulting from being or relating to the greater in number of two parts; the main part | Synonyms: majority |
| (noun) the property possessed by a large mass | - |
| (verb) cause to bulge or swell outwards | Synonyms: bulge |
| (verb) stick out or up | - |
| (verb) to gain size and weight by means of exercise and diet | - |
| bulkhead | (noun) a partition that divides a ship or plane into compartments | - |
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| bulkiness | (noun) an unwieldy largeness | Synonyms: massiveness |
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| bulky | (adjective) of large size for its weight | - |
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| bull | (noun) a serious and ludicrous blunder | - |
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| (noun) uncastrated adult male of domestic cattle | - |
| (noun) mature male of various mammals of which the female is called `cow'; e.g. whales or elephants or especially cattle | - |
| (noun) Obscene word for unacceptable behavior | Synonyms: bullshit, crap, dogshit, horseshit, Irish bull, shit |
| (noun) a formal proclamation issued by the pope (usually written in antiquated characters and sealed with a leaden bulla) | Synonyms: papal bull |
| (noun) the center of a target | Synonyms: bull's eye |
| (noun) uncomplimentary terms for a policeman | Synonyms: cop, copper, fuzz, pig |
| (noun) an investor with an optimistic market outlook; an investor who expects prices to rise and so buys now for resale later | - |
| (noun) a large and strong and heavyset man | Synonyms: bruiser, Samson, strapper |
| (verb) advance in price | - |
| (verb) speak insincerely or without regard for facts or truths | Synonyms: bullshit, fake, talk through one's hat |
| (verb) try to raise the price of stocks through speculative buying | - |
| (verb) push or force | Synonyms: bull through |
| bulla | (noun) the round leaden seal affixed to a papal bull | - |
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| (noun) (pathology) an elevation of the skin filled with serous fluid | Synonyms: bleb, blister |
| bullace | (noun) small wild or half-domesticated Eurasian plum bearing small ovoid fruit in clusters | Synonyms: Prunus insititia |
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| bullate | (adjective) of leaves; appearing puckered as if blistered | - |
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| bullbat | (noun) mainly nocturnal North American goatsucker | Synonyms: mosquito hawk, nighthawk |
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| bullbrier | (noun) a very prickly woody vine of the eastern United States growing in tangled masses having tough round stems with shiny leathery leaves and small greenish flowers followed by clusters of inedible shiny black berries | Synonyms: briar, brier, catbrier, greenbrier, horse-brier, horse brier, Smilax rotundifolia |
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| bulldog | (noun) a sturdy thickset short-haired breed with a large head and strong undershot lower jaw; developed originally in England for bull baiting | Synonyms: English bulldog |
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| (verb) attack viciously and ferociously | - |
| (verb) throw a steer by seizing the horns and twisting the neck, as in a rodeo | - |
| bulldoze | (verb) flatten with or as if with a bulldozer | - |
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| bulldozer | (noun) large powerful tractor; a large blade in front flattens areas of ground | Synonyms: dozer |
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| bullet | (noun) (baseball) a pitch thrown with maximum velocity | Synonyms: fastball, heater, hummer, smoke |
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| (noun) a projectile that is fired from a gun | Synonyms: slug |
| (noun) a high-speed passenger train | Synonyms: bullet train |
| bullethead | (noun) a head shaped like a bullet | - |
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| bulletin | (noun) a brief report (especially an official statement issued for immediate publication or broadcast) | - |
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| (verb) make public by bulletin | - |
| bulletproof | (adjective) not penetrable by bullets | - |
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| (adjective) without flaws or loopholes | Synonyms: ironclad, unassailable, unshakable, watertight |
| (verb) make bulletproof | - |
| bullfight | (noun) a Spanish or Portuguese or Latin American spectacle; a matador baits and (usually) kills a bull in an arena before many spectators | Synonyms: corrida |
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| bullfighter | (noun) someone who fights bulls | Synonyms: toreador |
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| bullfighting | (noun) the activity at a bullfight | Synonyms: tauromachy |
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| bullfinch | (noun) common European finch mostly black and white with red throat and breast | Synonyms: Pyrrhula pyrrhula |
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| bullfrog | (noun) largest North American frog; highly aquatic with a deep-pitched voice | Synonyms: Rana catesbeiana |
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| bullhead | (noun) freshwater sculpin with a large flattened bony-plated head with hornlike spines | - |
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| (noun) any of several common freshwater catfishes of the United States | Synonyms: bullhead catfish |
| bullheaded | (adjective) obstinate and stupid | Synonyms: bullet-headed, pigheaded |
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| bullheadedness | (noun) resolute adherence to your own ideas or desires | Synonyms: obstinacy, obstinance, pigheadedness, self-will, stubbornness |
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| bullhorn | (noun) a portable loudspeaker with built-in microphone and amplifier | Synonyms: loud-hailer, loud hailer |
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| bullion | (noun) gold or silver in bars or ingots | - |
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| (noun) a mass of precious metal | - |
| bullish | (adjective) expecting a rise in prices | - |
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| bullnecked | (adjective) having a thick short powerful neck | - |
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| bullnose | (noun) a small carpenter's plane with the cutting edge near the front | Synonyms: bullnosed plane |
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| bullock | (noun) castrated bull | Synonyms: steer |
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| (noun) young bull | - |
| bullocky | (adjective) resembling a bullock in strength and power | - |
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| bullpen | (noun) a large cell where prisoners (people awaiting trial or sentence or refugees or illegal immigrants) are confined together temporarily | Synonyms: detention cell, detention centre |
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| (noun) a place on a baseball field where relief pitchers can warm up during a game | - |