| 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 | - |
| 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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| 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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| 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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| bulgur | (noun) parched crushed wheat | Synonyms: bulghur, bulgur wheat |
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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 | (noun) a person suffering from bulimia | - |
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| 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 | - |
| 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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| 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 |
| 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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| 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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| 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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| 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 |
| 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 | - |
| 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 | - |
| 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 | - |
| bullring | (noun) a stadium where bullfights take place | - |
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| bullrush | (noun) tall rush with soft erect or arching stems found in Eurasia, Australia, New Zealand, and common in North America | Synonyms: bulrush, common rush, Juncus effusus, soft rush |
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| (noun) tall marsh plant with cylindrical seed heads that explode when mature shedding large quantities of down; its long flat leaves are used for making mats and chair seats; of North America, Europe, Asia and North Africa | Synonyms: bulrush, cat's-tail, nailrod, reed mace, reedmace, Typha latifolia |
| bullshit | (noun) Obscene word for unacceptable behavior | Synonyms: bull, crap, dogshit, horseshit, Irish bull, shit |
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| bullshot | (noun) a cocktail made with vodka and beef bouillon or consomme | - |
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| bullterrier | (noun) a powerful short-haired terrier originated in England by crossing the bulldog with terriers | Synonyms: bull terrier |
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| bully | (noun) a cruel and brutal fellow | Synonyms: hooligan, roughneck, rowdy, ruffian, tough, yob, yobbo, yobo |
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| (noun) a hired thug | - |
| bullyboy | (noun) a swaggering tough; usually one acting as an agent of a political faction | - |
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| bullying | (noun) the act of intimidating a weaker person to make them do something | Synonyms: intimidation |
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| bulrush | (noun) tall rush with soft erect or arching stems found in Eurasia, Australia, New Zealand, and common in North America | Synonyms: bullrush, common rush, Juncus effusus, soft rush |
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| (noun) tall marsh plant with cylindrical seed heads that explode when mature shedding large quantities of down; its long flat leaves are used for making mats and chair seats; of North America, Europe, Asia and North Africa | Synonyms: bullrush, cat's-tail, nailrod, reed mace, reedmace, Typha latifolia |
| bulwark | (noun) a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away | Synonyms: breakwater, groin, groyne, jetty, mole, seawall |
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| (noun) an embankment built around a space for defensive purposes | Synonyms: rampart, wall |
| (noun) a fencelike structure around a deck | - |