| butacaine | (noun) a white crystalline ester that is applied to mucous membranes as a local anesthetic | Synonyms: butacaine sulfate |
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| butadiene | (noun) a gaseous hydrocarbon C4H6; used in making synthetic rubbers | - |
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| butane | (noun) occurs in natural gas; used in the manufacture of rubber and fuels | - |
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| butanol | (noun) a flammable alcohol derived from butanes and used for solvents | Synonyms: butyl alcohol |
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| butanone | (noun) colorless soluble flammable liquid ketone used as a solvent for resins and as a paint remover and in lacquers and cements and adhesives and cleaning fluids and celluloid | Synonyms: methyl ethyl ketone |
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| butat | (noun) 100 bututs equal 1 dalasi in Gambia | Synonyms: butut |
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| butch | (noun) a closely cropped haircut; usually for men or boys | Synonyms: crew cut, flattop |
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| (noun) (slang) offensive term for a lesbian who is noticeably masculine | Synonyms: dike, dyke |
| butcher | (noun) a person who slaughters or dresses meat for market | Synonyms: slaughterer |
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| (noun) a brutal indiscriminate murderer | - |
| (noun) a retailer of meat | Synonyms: meatman |
| (noun) someone who makes mistakes because of incompetence | Synonyms: blunderer, botcher, bumbler, bungler, fuckup, fumbler, sad sack, stumbler |
| butcherbird | (noun) shrikes that impale their prey on thorns | - |
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| (noun) large carnivorous Australian bird with the shrike-like habit of impaling prey on thorns | - |
| butchering | (noun) the business of a butcher | Synonyms: butchery |
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| butchery | (noun) the business of a butcher | Synonyms: butchering |
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| (noun) the savage and excessive killing of many people | Synonyms: carnage, mass murder, massacre, slaughter |
| (noun) a building where animals are butchered | Synonyms: abattoir, shambles, slaughterhouse |
| butene | (noun) any of three isomeric hydrocarbons C4H8; all used in making synthetic rubbers | Synonyms: butylene |
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| buteonine | (noun) any hawk of the genus Buteo | - |
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| butler | (noun) a manservant (usually the head servant of a household) who has charge of wines and the table | Synonyms: pantryman |
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| butt | (noun) thick end of the handle | Synonyms: butt end |
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| (noun) the small unused part of something (especially the end of a cigarette that is left after smoking) | Synonyms: stub |
| (noun) a large cask (especially one holding a volume equivalent to 2 hogsheads or 126 gallons) | - |
| (noun) sports equipment consisting of an object set up for a marksman or archer to aim at | Synonyms: target |
| (noun) finely ground tobacco wrapped in paper; for smoking | Synonyms: cigaret, cigarette, coffin nail, fag |
| (noun) a joint made by fastening ends together without overlapping | Synonyms: butt joint |
| (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, backside, behind, bottom, bum, buns, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
| (noun) a victim of ridicule or pranks | Synonyms: goat, laughingstock, stooge |
| (noun) the part of a plant from which the roots spring or the part of a stalk or trunk nearest the roots | - |
| butte | (noun) a hill that rises abruptly from the surrounding region; has a flat top and sloping sides | - |
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| butter | (noun) an edible emulsion of fat globules made by churning milk or cream; for cooking and table use | - |
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| (noun) a fighter who strikes the opponent with his head | - |
| butterball | (noun) small North American diving duck; males have bushy head plumage | Synonyms: Bucephela albeola, bufflehead, dipper |
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| (noun) a rotund individual | Synonyms: fat person, fatso, fatty, roly-poly |
| butterbean | (noun) small flat green bean similar to lima beans | Synonyms: butter bean, civet bean, sieva bean |
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| butterbur | (noun) small Eurasian herb having broad leaves and lilac-pink rayless flowers; found in moist areas | Synonyms: bog rhubarb, Petasites hybridus, Petasites vulgaris |
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| buttercrunch | (noun) lettuce with delicate and relatively crunchy leaves | - |
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| buttercup | (noun) any of various plants of the genus Ranunculus | Synonyms: butter-flower, butterflower, crowfoot, goldcup, kingcup |
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| butterfat | (noun) the fatty substance of milk from which butter is made | - |
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| butterfingers | (noun) someone who drops things (especially one who cannot catch a ball) | - |
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| butterfish | (noun) small marine fish with a short compressed body and feeble spines | Synonyms: stromateid, stromateid fish |
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| (noun) slippery scaleless food fish of the northern Atlantic coastal waters | Synonyms: Pholis gunnellus, rock gunnel |
| (noun) any of numerous small flat Atlantic food fish having smooth skin | - |
| butterflower | (noun) any of various plants of the genus Ranunculus | Synonyms: butter-flower, buttercup, crowfoot, goldcup, kingcup |
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| butterfly | (noun) a swimming stroke in which the arms are thrown forward together out of the water while the feet kick up and down | Synonyms: butterfly stroke |
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| (noun) diurnal insect typically having a slender body with knobbed antennae and broad colorful wings | - |
| butterflyfish | (noun) tropical fish with huge fanlike pectoral fins for underwater gliding; unrelated to searobins | Synonyms: flying gurnard, flying robin |
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| buttermilk | (noun) residue from making butter from sour raw milk; or pasteurized milk curdled by adding a culture | - |
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| butternut | (noun) oily egg-shaped nut of an American tree of the walnut family | - |
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| (noun) North American walnut tree having light-brown wood and edible nuts; source of a light-brown dye | Synonyms: butternut tree, Juglans cinerea, white walnut |
| butterscotch | (noun) a hard brittle candy made with butter and brown sugar | - |
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| butterweed | (noun) any of several yellow-flowered plants of the genus Packera; often placed in genus Senecio | - |
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| (noun) American ragwort with yellow flowers | Synonyms: ragwort, Senecio glabellus |
| butterwort | (noun) any of numerous carnivorous bog plants of the genus Pinguicula having showy purple or yellow or white flowers and a rosette of basal leaves coated with a sticky secretion to trap small insects | - |
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| buttery | (noun) a teashop where students in British universities can purchase light meals | - |
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| (noun) a small storeroom for storing foods or wines | Synonyms: larder, pantry |
| buttinsky | (noun) a meddler who tends to butt in | - |
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| buttock | (noun) either of the two large fleshy masses of muscular tissue that form the human rump | Synonyms: cheek |
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| buttocks | (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, backside, behind, bottom, bum, buns, butt, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
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| button | (noun) a round fastener sewn to shirts and coats etc to fit through buttonholes | - |
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| (noun) an electrical switch operated by pressing | Synonyms: push, push button |
| (noun) a device that when pressed will release part of a mechanism | Synonyms: release |
| (noun) any artifact that resembles a button | - |
| (noun) a specific area or icon in graphical user interface systems that is clicked or pressed in order to select a command or perform an action | - |
| (noun) a female sexual organ homologous to the penis | Synonyms: clit, clitoris |
| (noun) a round flat badge displaying information and suitable for pinning onto a garment | - |
| (noun) any of various plant parts that resemble buttons | - |
| buttonhole | (noun) a hole through which buttons are pushed | Synonyms: button hole |
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| buttonhook | (noun) a hook for pulling a button through a buttonhole | - |
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| buttonwood | (noun) very large spreading plane tree of eastern and central North America to Mexico | Synonyms: American plane, American sycamore, Platanus occidentalis |
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| buttress | (noun) a support usually of stone or brick; supports the wall of a building | Synonyms: buttressing |
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| buttressing | (noun) a support usually of stone or brick; supports the wall of a building | Synonyms: buttress |
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| butty | (noun) a sandwich | - |
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| butut | (noun) 100 bututs equal 1 dalasi in Gambia | Synonyms: butat |
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| butyl | (noun) a hydrocarbon radical (C4H9) | - |
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| butylene | (noun) any of three isomeric hydrocarbons C4H8; all used in making synthetic rubbers | Synonyms: butene |
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| butyrin | (noun) any of three glycerides of butyric acid | - |
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