| birdie | (noun) badminton equipment consisting of a ball of cork or rubber with a crown of feathers | Synonyms: bird, shuttle, shuttlecock |
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| (noun) (golf) a score of one stroke under par on a hole | - |
| birdlime | (noun) a sticky adhesive that is smeared on small branches to capture small birds | Synonyms: lime |
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| birdnest | (noun) nest where birds lay their eggs and hatch their young | Synonyms: bird's nest, bird nest |
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| birdnesting | (noun) hunting for birds' nests to get the eggs | - |
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| birdseed | (noun) food given to birds; usually mixed seeds | Synonyms: bird feed, bird food |
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| birdsong | (noun) the characteristic sound produced by a bird | Synonyms: birdcall, call, song |
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| birthday | (noun) an anniversary of the day on which a person was born (or the celebration of it) | - |
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| (noun) the date on which a person was born | Synonyms: natal day |
| bitterweed | (noun) any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma | Synonyms: ambrosia, ragweed |
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| (noun) widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States | Synonyms: bristly oxtongue, bugloss, oxtongue, Picris echioides |
| bitterwood | (noun) handsome South American shrub or small tree having bright scarlet flowers and yielding a valuable fine-grained yellowish wood; yields the bitter drug quassia from its wood and bark | Synonyms: quassia, Quassia amara |
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| (noun) West Indian tree yielding the drug Jamaica quassia | Synonyms: Jamaica quassia, Picrasma excelsa, Picrasma excelsum |
| (noun) medium to large tree of tropical North and South America having odd-pinnate leaves and long panicles of small pale yellow flowers followed by scarlet fruits | Synonyms: paradise tree, Simarouba glauca |
| bitthead | (noun) the upper end of a bitt | - |
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| blackbird | (noun) any bird of the family Icteridae whose male is black or predominantly black | Synonyms: New World blackbird |
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| (noun) common black European thrush | Synonyms: European blackbird, merl, merle, ousel, ouzel, Turdus merula |
| blackboard | (noun) sheet of slate; for writing with chalk | Synonyms: chalkboard |
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| blackbody | (noun) a hypothetical object capable of absorbing all the electromagnetic radiation falling on it | Synonyms: black body, full radiator |
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| blackdamp | (noun) the atmosphere in a mine following an explosion; high in carbon dioxide and incapable of supporting life | Synonyms: chokedamp |
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| blackguard | (noun) someone who is morally reprehensible | Synonyms: bounder, cad, dog, heel, hound |
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| blackhead | (noun) a black-tipped plug clogging a pore of the skin | Synonyms: comedo |
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| blackseed | (noun) grass native to West Indies but common in southern United States having tufted wiry stems often infested with a dark fungus | Synonyms: carpet grass, smut grass, Sporobolus poiretii |
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| blackwood | (noun) any of several hardwood trees yielding very dark-colored wood | Synonyms: blackwood tree |
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| (noun) very dark wood of any of several blackwood trees | - |
| bladder | (noun) a bag that fills with air | - |
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| (noun) a distensible membranous sac (usually containing liquid or gas) | Synonyms: vesica |
| bladdernose | (noun) medium-sized blackish-grey seal with large inflatable sac on the head; of Arctic and northern Atlantic waters | Synonyms: Cystophora cristata, hooded seal |
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| bladderpod | (noun) any of several hairy North American herbs having yellow racemose flowers and inflated pods | - |
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| (noun) any of several plants of the genus Physaria having racemose yellow flowers and inflated pods | - |
| (noun) annual or perennial herbs with inflated seed pods; some placed in genus Lesquerella | - |
| (noun) North American wild lobelia having small blue flowers and inflated capsules formerly used as an antispasmodic | Synonyms: Indian tobacco, Lobelia inflata |
| bladderwort | (noun) any of numerous aquatic carnivorous plants of the genus Utricularia some of whose leaves are modified as small urn-shaped bladders that trap minute aquatic animals | - |
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| bladderwrack | (noun) a common rockweed used in preparing kelp and as manure | Synonyms: black rockweed, bladder fucus, Fucus vesiculosus, tang |
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| (noun) similar to and found with black rockweed | Synonyms: Ascophyllum nodosum |
| blade | (noun) the flat part of a tool or weapon that (usually) has a cutting edge | - |
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| (noun) a cutting or thrusting weapon that has a long metal blade and a hilt with a hand guard | Synonyms: brand, steel, sword |
| (noun) flat surface that rotates and pushes against air or water | Synonyms: vane |
| (noun) the part of the skate that slides on the ice | - |
| (noun) a broad flat body part (as of the shoulder or tongue) | - |
| (noun) a cut of beef from the shoulder blade | - |
| (noun) something long and thin resembling a blade of grass | - |
| (noun) a dashing young man | - |
| (noun) especially a leaf of grass or the broad portion of a leaf as distinct from the petiole | Synonyms: leaf blade |
| blandishment | (noun) the act of urging by means of teasing or flattery | Synonyms: wheedling |
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| (noun) flattery intended to persuade | Synonyms: cajolery, palaver |
| blandness | (noun) lacking any distinctive or interesting taste property | Synonyms: insipidity, insipidness |
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| (noun) the quality of being bland and gracious or ingratiating in manner | Synonyms: smoothness, suaveness, suavity |
| (noun) the trait of exhibiting no personal embarrassment or concern | - |
| blastoderm | (noun) a layer of cells on the inside of the blastula | Synonyms: blastodisc, germinal area, germinal disc |
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| blastodisc | (noun) a layer of cells on the inside of the blastula | Synonyms: blastoderm, germinal area, germinal disc |
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| bleeder | (noun) someone who has hemophilia and is subject to uncontrollable bleeding | Synonyms: haemophile, haemophiliac, hemophile, hemophiliac |
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| bleeding | (noun) the flow of blood from a ruptured blood vessel | Synonyms: haemorrhage, hemorrhage |
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| blend | (noun) the act of blending components together thoroughly | Synonyms: blending |
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| (noun) a new word formed by joining two others and combining their meanings | Synonyms: portmanteau, portmanteau word |
| (noun) an occurrence of thorough mixing | - |
| blende | (noun) an ore that is the chief source of zinc; consists largely of zinc sulfide in crystalline form | Synonyms: sphalerite, zinc blende |
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| blender | (noun) an electrically powered mixer with whirling blades that mix or chop or liquefy foods | Synonyms: liquidiser, liquidizer |
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| blending | (noun) a gradation involving small or imperceptible differences between grades | Synonyms: shading |
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| (noun) the act of blending components together thoroughly | Synonyms: blend |
| blennioid | (noun) elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins | Synonyms: blennioid fish |
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| blessedness | (noun) a state of supreme happiness | Synonyms: beatification, beatitude |
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| blind | (noun) a protective covering that keeps things out or hinders sight | Synonyms: screen |
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| (noun) a hiding place sometimes used by hunters (especially duck hunters) | - |
| (noun) something intended to misrepresent the true nature of an activity | Synonyms: subterfuge |
| (noun) people who have severe visual impairments, considered as a group | - |
| blinder | (noun) blind consisting of a leather eyepatch sewn to the side of the halter that prevents a horse from seeing something on either side | Synonyms: blinker, winker |
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| blindfold | (noun) a cloth used to cover the eyes | - |
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| blindness | (noun) the state of being blind or lacking sight | Synonyms: cecity, sightlessness |
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| blindworm | (noun) small burrowing legless European lizard with tiny eyes; popularly believed to be blind | Synonyms: Anguis fragilis, slowworm |
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| (noun) any of the small slender limbless burrowing wormlike amphibians of the order Gymnophiona; inhabit moist soil in tropical regions | Synonyms: caecilian |
| blizzard | (noun) a series of unexpected and unpleasant occurrences | Synonyms: rash |
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| (noun) a storm with widespread snowfall accompanied by strong winds | Synonyms: snowstorm |
| blockade | (noun) a war measure that isolates some area of importance to the enemy | Synonyms: encirclement |
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| (noun) prevents access or progress | - |
| blockhead | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: bonehead, dumbass, dunce, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, muttonhead, numskull, shithead |
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| blond | (noun) a light grayish yellow to near white | Synonyms: blonde |
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| (noun) a male person with fair skin and hair | - |
| blonde | (noun) a light grayish yellow to near white | Synonyms: blond |
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| (noun) a female person with fair skin and hair | - |
| blondness | (noun) the property of having a naturally light complexion | Synonyms: fairness, paleness |
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| blood | (noun) temperament or disposition | - |
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| (noun) the fluid (red in vertebrates) that is pumped through the body by the heart and contains plasma, blood cells, and platelets | - |
| (noun) the hereditary derivation of an individual | Synonyms: ancestry, blood line, bloodline, descent, line, line of descent, lineage, origin, parentage, pedigree, stemma, stock |
| (noun) people viewed as members of a group | - |
| (noun) a dissolute man in fashionable society | Synonyms: profligate, rake, rakehell, rip, roue |
| bloodbath | (noun) indiscriminate slaughter | Synonyms: battue, bloodletting, bloodshed |
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| bloodberry | (noun) bushy houseplant having white to pale pink flowers followed by racemes of scarlet berries; tropical Americas | Synonyms: blood berry, Rivina humilis, rouge plant, rougeberry |
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| bloodguilt | (noun) the state of being guilty of bloodshed and murder | - |
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| bloodhound | (noun) a breed of large powerful hound of European origin having very acute smell and used in tracking | Synonyms: sleuthhound |
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| bloodiness | (noun) a disposition to shed blood | Synonyms: bloodthirstiness |
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| (noun) the state of being bloody | - |
| bloodleaf | (noun) any plant of the genus Iresine having colored foliage | - |
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| bloodletting | (noun) formerly used as a treatment to reduce excess blood (one of the four humors of medieval medicine) | - |
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| (noun) indiscriminate slaughter | Synonyms: battue, bloodbath, bloodshed |
| bloodline | (noun) ancestry of a purebred animal | Synonyms: pedigree |
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| (noun) the hereditary derivation of an individual | Synonyms: ancestry, blood, blood line, descent, line, line of descent, lineage, origin, parentage, pedigree, stemma, stock |
| bloodlust | (noun) a desire for bloodshed | - |
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| bloodmobile | (noun) a motor vehicle equipped to collect blood donations | - |
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| bloodroot | (noun) perennial woodland native of North America having a red root and red sap and bearing a solitary lobed leaf and white flower in early spring and having acrid emetic properties; rootstock used as a stimulant and expectorant | Synonyms: puccoon, redroot, Sanguinaria canadensis, tetterwort |
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| bloodshed | (noun) indiscriminate slaughter | Synonyms: battue, bloodbath, bloodletting |
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| (noun) the shedding of blood resulting in murder | Synonyms: gore |
| bloodstain | (noun) a discoloration caused by blood | - |
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| bloodstock | (noun) thoroughbred horses (collectively) | - |
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| bloodstone | (noun) green chalcedony with red spots that resemble blood | Synonyms: heliotrope |
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| bloodstream | (noun) the blood flowing through the circulatory system | Synonyms: blood stream |
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| bloodsucker | (noun) carnivorous or bloodsucking aquatic or terrestrial worms typically having a sucker at each end | Synonyms: hirudinean, leech |
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| bloodthirstiness | (noun) a disposition to shed blood | Synonyms: bloodiness |
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| bloodworm | (noun) a segmented marine worm with bright red body; often used for bait | - |
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| bloodwort | (noun) any of various plants of the family Haemodoraceae; roots contain a deep red coloring matter | - |
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| blowhard | (noun) a very boastful and talkative person | Synonyms: boaster, braggart, bragger, line-shooter, vaunter |
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| bludgeon | (noun) a club used as a weapon | - |
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| bludgeoner | (noun) an assailant who uses a bludgeon | - |
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| bluebird | (noun) blue North American songbird | - |
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| (noun) fruit-eating mostly brilliant blue songbird of the East Indies | Synonyms: fairy bluebird |
| bluehead | (noun) small Atlantic wrasse the male of which has a brilliant blue head | Synonyms: Thalassoma bifasciatum |
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| blueweed | (noun) a coarse prickly European weed with spikes of blue flowers; naturalized in United States | Synonyms: blue devil, blue thistle, Echium vulgare, viper's bugloss |
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| blunder | (noun) an embarrassing mistake | Synonyms: bloomer, blooper, boner, boo-boo, botch, bungle, flub, foul-up, fuckup, pratfall |
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| blunderbuss | (noun) a short musket of wide bore with a flared muzzle | - |
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| blunderer | (noun) someone who makes mistakes because of incompetence | Synonyms: botcher, bumbler, bungler, butcher, fuckup, fumbler, sad sack, stumbler |
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| board | (noun) a flat piece of material designed for a special purpose | - |
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| (noun) a table at which meals are served | Synonyms: dining table |
| (noun) electrical device consisting of a flat insulated surface that contains switches and dials and meters for controlling other electrical devices | Synonyms: control board, control panel, instrument panel, panel |
| (noun) a vertical surface on which information can be displayed to public view | Synonyms: display board, display panel |
| (noun) a printed circuit that can be inserted into expansion slots in a computer to increase the computer's capabilities | Synonyms: add-in, card, circuit board, circuit card, plug-in |
| (noun) a flat portable surface (usually rectangular) designed for board games | Synonyms: gameboard |
| (noun) food or meals in general | Synonyms: table |
| (noun) a committee having supervisory powers | - |
| (noun) a stout length of sawn timber; made in a wide variety of sizes and used for many purposes | Synonyms: plank |
| boarder | (noun) a tenant in someone's house | Synonyms: lodger, roomer |
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| (noun) a pupil who lives at school during term time | - |
| (noun) someone who forces their way aboard ship | - |
| boarding | (noun) the act of passengers and crew getting aboard a ship or aircraft | Synonyms: embarkation, embarkment |
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| (noun) a structure of boards | - |
| boardinghouse | (noun) a private house that provides accommodations and meals for paying guests | Synonyms: boarding house |
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| boardroom | (noun) a room where a committee meets (such as the board of directors of a company) | Synonyms: council chamber |
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| boards | (noun) (used in the plural) the boarding that surrounds an ice hockey rink | - |
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| (noun) (used in the plural) the stage of a theater | - |
| boardwalk | (noun) a walkway made of wooden boards; usually at seaside | - |
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| boarhound | (noun) large hound used in hunting wild boars | - |
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| boatbuilder | (noun) a person who builds boats | - |
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| boatload | (noun) the amount of cargo that can be held by a boat or ship or a freight car | Synonyms: carload, shipload |
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| boatyard | (noun) a place where boats are built or maintained or stored | - |
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| bobsled | (noun) a long racing sled (for 2 or more people) with a steering mechanism | Synonyms: bob, bobsleigh |
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| (noun) formerly two short sleds coupled together | Synonyms: bobsleigh |
| bobsledding | (noun) riding on a bobsled | - |
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| bod | (noun) alternative names for the body of a human being | Synonyms: anatomy, build, chassis, figure, flesh, form, frame, human body, material body, physical body, physique, shape, soma |
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| bodega | (noun) a small Hispanic shop selling wine and groceries | - |
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| bodice | (noun) part of a dress above the waist | - |
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| boding | (noun) a feeling of evil to come | Synonyms: foreboding, premonition, presentiment |
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| bodkin | (noun) a blunt needle for threading ribbon through loops | Synonyms: threader |
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| (noun) a small sharp-pointed tool for punching holes in leather or fabric | - |
| (noun) formerly a long hairpin; usually with an ornamental head | - |
| (noun) a dagger with a slender blade | Synonyms: poniard |
| body | (noun) the external structure of a vehicle | - |
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| (noun) a resonating chamber in a musical instrument (as the body of a violin) | Synonyms: soundbox |
| (noun) the property of holding together and retaining its shape | Synonyms: consistence, consistency, substance |
| (noun) the main mass of a thing | - |
| (noun) the entire physical structure of an organism (an animal, plant, or human being) | Synonyms: organic structure |
| (noun) the body excluding the head and neck and limbs | Synonyms: torso, trunk |
| (noun) a natural object consisting of a dead animal or person | Synonyms: dead body |
| (noun) the central message of a communication | - |
| (noun) a group of persons associated by some common tie or occupation and regarded as an entity | - |
| (noun) a collection of particulars considered as a system | - |
| (noun) an individual 3-dimensional object that has mass and that is distinguishable from other objects | - |
| bodybuilder | (noun) someone who does special exercises to develop a brawny musculature | Synonyms: muscle-builder, muscle builder, musclebuilder, muscleman |
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| bodybuilding | (noun) exercise that builds muscles through tension | Synonyms: anaerobic exercise, muscle building, musclebuilding |
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| bodyguard | (noun) a group of men who escort and protect some important person | - |
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| (noun) someone who escorts and protects a prominent person | Synonyms: escort |
| bodywork | (noun) the work of making or repairing vehicle bodies | - |
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| (noun) the exterior body of a motor vehicle | - |