| birdhouse | (noun) a shelter for birds | - |
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| 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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| birefringence | (noun) splitting a ray into two parallel rays polarized perpendicularly | Synonyms: double refraction |
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| biretta | (noun) a stiff cap with ridges across the crown; worn by Roman Catholic clergy | Synonyms: berretta, birretta |
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| biriani | (noun) an Indian dish made with highly seasoned rice and meat or fish or vegetables | Synonyms: biryani |
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| birling | (noun) rotating a log rapidly in the water (as a competitive sport) | Synonyms: logrolling |
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| birr | (noun) the basic unit of money in Ethiopia; equal to 100 cents | - |
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| (noun) sound of something in rapid motion | Synonyms: whir, whirr, whirring |
| birretta | (noun) a stiff cap with ridges across the crown; worn by Roman Catholic clergy | Synonyms: berretta, biretta |
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| birth | (noun) the event of being born | Synonyms: nascence, nascency, nativity |
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| (noun) a baby born; an offspring | - |
| (noun) the process of giving birth | Synonyms: birthing, giving birth, parturition |
| (noun) the kinship relation of an offspring to the parents | Synonyms: parentage |
| (noun) the time when something begins (especially life) | - |
| 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 |
| birthing | (noun) the process of giving birth | Synonyms: birth, giving birth, parturition |
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| birthmark | (noun) a blemish on the skin that is formed before birth | Synonyms: nevus |
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| birthplace | (noun) the place where someone was born | Synonyms: place of birth |
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| (noun) where something originated or was nurtured in its early existence | Synonyms: cradle, place of origin, provenance, provenience |
| birthrate | (noun) the ratio of live births in an area to the population of that area; expressed per 1000 population per year | Synonyms: birth rate, fertility, fertility rate, natality |
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| birthright | (noun) a right or privilege that you are entitled to at birth | - |
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| (noun) an inheritance coming by right of birth (especially by primogeniture) | Synonyms: patrimony |
| birthroot | (noun) trillium of eastern North America having malodorous pink to purple flowers and an astringent root used in folk medicine especially to ease childbirth | Synonyms: purple trillium, red trillium, Trillium erectum |
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| birthwort | (noun) creeping plant having curving flowers thought to resemble fetuses; native to Europe; naturalized Great Britain and eastern North America | Synonyms: Aristolochia clematitis |
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| biryani | (noun) an Indian dish made with highly seasoned rice and meat or fish or vegetables | Synonyms: biriani |
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| biscuit | (noun) small round bread leavened with baking-powder or soda | - |
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| (noun) any of various small flat sweet cakes | Synonyms: cookie, cooky |
| bise | (noun) a dry cold north wind in southeastern France | Synonyms: bize |
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| bisection | (noun) dividing into two equal parts | - |
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| bisexual | (noun) a person who is sexually attracted to both sexes | Synonyms: bisexual person |
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| bisexuality | (noun) sexual activity with both men and women | - |
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| (noun) showing characteristics of both sexes | Synonyms: androgyny, hermaphroditism |
| bishop | (noun) (chess) a piece that can be moved diagonally over unoccupied squares of the same color | - |
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| (noun) port wine mulled with oranges and cloves | - |
| (noun) a senior member of the Christian clergy having spiritual and administrative authority; appointed in Christian churches to oversee priests or ministers; considered in some churches to be successors of the twelve Apostles of Christ | - |
| bishopric | (noun) the territorial jurisdiction of a bishop | Synonyms: diocese, episcopate |
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| bishopry | (noun) the office and dignity of a bishop | Synonyms: episcopate |
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| bismark | (noun) a raised doughnut filled with jelly or jam | Synonyms: Berlin doughnut, jelly doughnut |
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| bismuth | (noun) a heavy brittle diamagnetic trivalent metallic element (resembles arsenic and antimony chemically); usually recovered as a by-product from ores of other metals | Synonyms: atomic number 83, Bi |
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| bison | (noun) any of several large humped bovids having shaggy manes and large heads and short horns | - |
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| bispak | (noun) A sexually promiscuous Indonesian woman | - |
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| bisque | (noun) a thick cream soup made from shellfish | - |
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| bister | (noun) a water-soluble brownish-yellow pigment made by boiling wood soot | Synonyms: bistre |
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| bistre | (noun) a water-soluble brownish-yellow pigment made by boiling wood soot | Synonyms: bister |
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| bistro | (noun) a small informal restaurant; serves wine | - |
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| bisulfate | (noun) a salt or an ester of sulphuric acid with the chemical formula HSO4-. | Synonyms: hydrogen sulfate |
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| bit | (noun) the cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock or drill press | - |
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| (noun) piece of metal held in horse's mouth by reins and used to control the horse while riding | - |
| (noun) the part of a key that enters a lock and lifts the tumblers | - |
| (noun) a short performance that is part of a longer program | Synonyms: act, number, routine, turn |
| (noun) a small fragment | Synonyms: snatch |
| (noun) an instance of some kind | Synonyms: piece |
| (noun) a small amount of solid food; a mouthful | Synonyms: bite, morsel |
| (noun) a small fragment of something broken off from the whole | Synonyms: chip, flake, fleck, scrap |
| (noun) a unit of measurement of information (from binary + digit); the amount of information in a system having two equiprobable states | - |
| (noun) a small piece or quantity of something | Synonyms: spot |
| (noun) an indefinitely short time | Synonyms: minute, mo, moment, second |
| bitartrate | (noun) an acid tartrate; a hydrogen tartrate | - |
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| bitch | (noun) female of any member of the dog family | - |
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| (noun) informal terms for objecting | Synonyms: beef, gripe, kick, squawk |
| (noun) a person (usually but not necessarily a woman) who is thoroughly disliked | Synonyms: cunt |
| (noun) an unpleasant difficulty | - |
| bitchery | (noun) aggressive remarks and behavior like that of a spiteful malicious woman | - |
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| bitchiness | (noun) malevolence by virtue of being malicious or spiteful or nasty | Synonyms: cattiness, nastiness, spite, spitefulness |
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| bite | (noun) the act of gripping or chewing off with the teeth and jaws | Synonyms: chomp |
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| (noun) a portion removed from the whole | - |
| (noun) a strong odor or taste property | Synonyms: pungency, raciness, sharpness |
| (noun) wit having a sharp and caustic quality | Synonyms: pungency |
| (noun) (angling) an instance of a fish taking the bait | - |
| (noun) a light informal meal | Synonyms: collation, snack |
| (noun) a small amount of solid food; a mouthful | Synonyms: bit, morsel |
| (noun) a wound resulting from biting by an animal or a person | - |
| (noun) a painful wound caused by the thrust of an insect's stinger into skin | Synonyms: insect bite, sting |
| biteplate | (noun) a removable dental appliance that is worn in the palate for diagnostic or therapeutic purposes | Synonyms: bite plate |
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| biter | (noun) someone who bites | - |
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| bitewing | (noun) a dental X-ray film that can be held in place by the teeth during radiography | - |
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| bitmap | (noun) an image represented as a two dimensional array of brightness values for pixels | Synonyms: electronic image |
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| bitok | (noun) a Russian dish made with patties of ground meat (mixed with onions and bread and milk) and served with a sauce of sour cream | - |
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| bitstock | (noun) a carpenter's tool having a crank handle for turning and a socket to hold a bit for boring | Synonyms: brace |
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| bitt | (noun) a strong post (as on a wharf or quay or ship for attaching mooring lines) | Synonyms: bollard |
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| bitter | (noun) the property of having a harsh unpleasant taste | Synonyms: bitterness |
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| (noun) the taste experience when quinine or coffee is taken into the mouth | Synonyms: bitterness |
| (noun) English term for a dry sharp-tasting ale with strong flavor of hops (usually on draft) | - |
| bittercress | (noun) any of various herbs of the genus Cardamine, having usually pinnate leaves and racemes of white, pink or purple flowers; cosmopolitan except Antarctic | Synonyms: bitter cress |
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| bittern | (noun) relatively small compact tawny-brown heron with nocturnal habits and a booming cry; found in marshes | - |
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| bitterness | (noun) the property of having a harsh unpleasant taste | Synonyms: bitter |
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| (noun) a rough and bitter manner | Synonyms: acerbity, acrimony, jaundice, tartness, thorniness |
| (noun) the taste experience when quinine or coffee is taken into the mouth | Synonyms: bitter |
| (noun) a feeling of deep and bitter anger and ill-will | Synonyms: gall, rancor, rancour, resentment |
| bitternut | (noun) hickory of the eastern United States having a leaves with 7 or 9 leaflets and thin-shelled very bitter nuts | Synonyms: bitter hickory, bitter pignut, bitternut hickory, Carya cordiformis, swamp hickory |
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| bitterroot | (noun) showy succulent ground-hugging plant of Rocky Mountains regions having deep to pale pink flowers and fleshy farinaceous roots; the Montana state flower | Synonyms: Lewisia rediviva |
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| bitters | (noun) alcoholic liquor flavored with bitter herbs and roots | - |
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| bittersweet | (noun) twining shrub of North America having yellow capsules enclosing scarlet seeds | Synonyms: American bittersweet, Celastrus scandens, climbing bittersweet, false bittersweet, shrubby bittersweet, staff vine, waxwork |
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| (noun) poisonous perennial Old World vine having violet flowers and oval coral-red berries; widespread weed in North America | Synonyms: bittersweet nightshade, climbing nightshade, deadly nightshade, poisonous nightshade, Solanum dulcamara, woody nightshade |
| 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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| bitumastic | (noun) a protective coating of asphalt and filter used on structural metals that are exposed to weathering | - |
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| bitumen | (noun) any of various naturally occurring impure mixtures of hydrocarbons | - |
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| bivalve | (noun) marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together | Synonyms: lamellibranch, pelecypod |
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| bivouac | (noun) temporary living quarters specially built by the army for soldiers | Synonyms: camp, cantonment, encampment |
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| (noun) a site where people on holiday can pitch a tent | Synonyms: campground, camping area, camping ground, camping site, campsite, encampment |
| bivouacking | (noun) the act of encamping and living in tents in a camp | Synonyms: camping, encampment, tenting |
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| biweekly | (noun) a periodical that is published twice a week or every two weeks (either 104 or 26 issues per year) | - |
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| biz | (noun) your occupation or line of work | Synonyms: game |
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| bizarreness | (noun) strikingly out of the ordinary | Synonyms: outlandishness, weirdness |
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| bize | (noun) a dry cold north wind in southeastern France | Synonyms: bise |
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| blabber | (noun) one who reveals confidential information to the police or other authority | Synonyms: betrayer, informer, rat, squealer |
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| blabbermouth | (noun) someone who gossips indiscreetly | Synonyms: talebearer, taleteller, tattler, tattletale, telltale |
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| black | (noun) black clothing (worn as a sign of mourning) | - |
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| (noun) (board games) the darker pieces | - |
| (noun) the quality or state of the achromatic color of least lightness (bearing the least resemblance to white) | Synonyms: blackness, inkiness |
| (noun) total absence of light | Synonyms: blackness, lightlessness, pitch blackness, total darkness |
| blackamoor | (noun) a person with dark skin who comes from Africa (or whose ancestors came from Africa) | Synonyms: Black person |
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| blackball | (noun) the act of excluding someone by a negative vote or veto | Synonyms: barring |
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| blackbeetle | (noun) dark brown cockroach originally from orient now nearly cosmopolitan in distribution | Synonyms: Asiatic cockroach, Blatta orientalis, oriental cockroach, oriental roach |
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| blackberry | (noun) large sweet black or very dark purple edible aggregate fruit of any of various bushes of the genus Rubus | - |
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| (noun) bramble with sweet edible black or dark purple berries that usually do not separate from the receptacle | Synonyms: blackberry bush |
| 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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| blackbuck | (noun) common Indian antelope with a dark back and spiral horns | Synonyms: Antilope cervicapra, black buck |
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| blackcap | (noun) small brownish-grey warbler with a black crown | Synonyms: Silvia atricapilla |
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| (noun) chickadee having a dark crown | Synonyms: black-capped chickadee, Parus atricapillus |
| (noun) small black-headed European gull | Synonyms: Larus ridibundus, laughing gull, pewit, pewit gull |
| (noun) raspberry native to eastern North America having black thimble-shaped fruit | Synonyms: black raspberry, blackcap raspberry, Rubus occidentalis, thimbleberry |
| blackcock | (noun) male black grouse | Synonyms: black cock |
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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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| blackening | (noun) changing to a darker color | Synonyms: darkening |
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| blackface | (noun) the makeup (usually burnt cork) used by a performer in order to imitate a Negro | - |
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| blackfish | (noun) female salmon that has recently spawned | - |
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| (noun) small dark-colored whale of the Atlantic coast of the United States; the largest male acts as pilot or leader for the school | Synonyms: black whale, common blackfish, Globicephala melaena, pilot whale |
| (noun) large dark-colored food fish of the Atlantic coast of North America | Synonyms: tautog, Tautoga onitis |
| blackfly | (noun) small blackish stout-bodied biting fly having aquatic larvae; sucks the blood of birds as well as humans and other mammals | Synonyms: black fly, buffalo gnat |
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| (noun) blackish aphid that infests e.g. beans and sugar beets | Synonyms: Aphis fabae, bean aphid |
| 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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| blackheart | (noun) heart cherry with dark flesh and skin | Synonyms: blackheart cherry |
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| (noun) any of various diseases in which the central tissues blacken | - |
| blacking | (noun) a substance used to produce a shiny protective surface on footwear | Synonyms: shoe polish |
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| blackjack | (noun) a gambling game using cards; the object is to hold cards having a higher count than those dealt to the banker up to but not exceeding 21 | Synonyms: twenty-one, vingt-et-un |
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| (noun) a piece of metal covered by leather with a flexible handle; used for hitting people | Synonyms: cosh, sap |
| (noun) a flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship | Synonyms: black flag, Jolly Roger, pirate flag |
| (noun) a common scrubby deciduous tree of central and southeastern United States having dark bark and broad three-lobed (club-shaped) leaves; tends to form dense thickets | Synonyms: blackjack oak, jack oak, Quercus marilandica |
| blackleg | (noun) someone who works (or provides workers) during a strike | Synonyms: rat, scab, strikebreaker |
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| blacklist | (noun) a list of people who are out of favor | Synonyms: black book, shitlist |
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| blackmail | (noun) extortion of money by threats to divulge discrediting information | - |
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| blackmailer | (noun) a criminal who extorts money from someone by threatening to expose embarrassing information about them | Synonyms: extortioner, extortionist |
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