| buccal | (adjective) of or involving the mouth or mouth region or the surface on which the mouth is located | Synonyms: oral |
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| (adjective) of or relating to or toward the cheek | - |
| buccaneer | (noun) someone who robs at sea or plunders the land from the sea without having a commission from any sovereign nation | Synonyms: pirate, sea robber, sea rover |
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| (verb) live like a buccaneer | - |
| buccaneering | (noun) hijacking on the high seas or in similar contexts; taking a ship or plane away from the control of those who are legally entitled to it | Synonyms: piracy |
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| buccula | (noun) a fold of fatty tissue under the chin | Synonyms: double chin |
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| buck | (noun) mature male of various mammals (especially deer or antelope) | - |
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| (noun) a framework for holding wood that is being sawed | Synonyms: horse, sawbuck, sawhorse |
| (noun) a gymnastic horse without pommels and with one end elongated; used lengthwise for vaulting | Synonyms: long horse, vaulting horse |
| (noun) a piece of paper money worth one dollar | Synonyms: clam, dollar, dollar bill, one dollar bill |
| (verb) jump vertically, with legs stiff and back arched | Synonyms: hitch, jerk |
| (verb) move quickly and violently | Synonyms: charge, shoot, shoot down, tear |
| (verb) resist | Synonyms: go against |
| (verb) to strive with determination | - |
| buckaroo | (noun) local names for a cowboy (`vaquero' is used especially in southwestern and central Texas and `buckaroo' is used especially in California) | Synonyms: buckeroo, vaquero |
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| buckbean | (noun) perennial plant of Europe and America having racemes of white or purplish flowers and intensely bitter trifoliate leaves; often rooting at water margin and spreading across the surface | Synonyms: bog myrtle, bogbean, marsh trefoil, Menyanthes trifoliata, water shamrock |
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| buckboard | (noun) an open horse-drawn carriage with four wheels; has a seat attached to a flexible board between the two axles | - |
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| buckeroo | (noun) local names for a cowboy (`vaquero' is used especially in southwestern and central Texas and `buckaroo' is used especially in California) | Synonyms: buckaroo, vaquero |
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| bucket | (noun) a roughly cylindrical vessel that is open at the top | Synonyms: pail |
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| (noun) the quantity contained in a bucket | Synonyms: bucketful |
| (verb) carry in a bucket | - |
| (verb) put into a bucket | - |
| bucketful | (noun) the quantity contained in a bucket | Synonyms: bucket |
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| buckeye | (noun) tree having palmate leaves and large clusters of white to red flowers followed by brown shiny inedible seeds | Synonyms: Aesculus hippocastanum, horse chestnut |
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| (noun) the inedible nutlike seed of the horse chestnut | Synonyms: conker, horse chestnut |
| buckle | (noun) fastener that fastens together two ends of a belt or strap; often has loose prong | - |
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| (noun) a shape distorted by twisting or folding | Synonyms: warp |
| (verb) bend out of shape, as under pressure or from heat | Synonyms: heave, warp |
| (verb) fasten with a buckle or buckles | Synonyms: clasp |
| (verb) fold or collapse | Synonyms: crumple |
| buckler | (noun) armor carried on the arm to intercept blows | Synonyms: shield |
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| buckleya | (noun) parasitic shrub of the eastern United States having opposite leaves and insignificant greenish flowers followed by oily dull green olivelike fruits | Synonyms: Buckleya distichophylla |
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| buckminsterfullerene | (noun) a spheroidal fullerene; the first known example of a fullerene | Synonyms: buckyball |
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| buckram | (adjective) rigidly formal | Synonyms: starchy, stiff |
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| (noun) a coarse cotton fabric stiffened with glue; used in bookbinding and to stiffen clothing | - |
| (verb) stiffen with or as with buckram | - |
| bucksaw | (noun) a saw that is set in a frame in the shape of an H; used with both hands to cut wood that is held in a sawbuck | - |
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| buckshee | (adjective) free of charge | - |
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| buckshot | (noun) small lead shot for shotgun shells | Synonyms: bird shot, duck shot |
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| buckskin | (noun) horse of a light yellowish dun color with dark mane and tail | - |
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| (noun) a soft yellowish suede leather originally from deerskin but now usually from sheepskin | - |
| buckskins | (noun) (used in the plural) breeches made of buckskin | - |
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| buckthorn | (noun) any shrub or small tree of the genus Bumelia | - |
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| (noun) a shrub or shrubby tree of the genus Rhamnus; fruits are source of yellow dyes or pigments | - |
| (noun) an Old World plantain with long narrow ribbed leaves widely established in temperate regions | Synonyms: English plantain, narrow-leaved plantain, Plantago lanceolata, ribgrass, ribwort, ripple-grass |
| 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 |