| aztreonam | (noun) an antibiotic (trade name Azactam) used against severe infections; has minimal side effects | Synonyms: Azactam |
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| bacchanal | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanalian, bacchic, carousing, orgiastic |
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| (noun) a wild gathering involving excessive drinking and promiscuity | Synonyms: bacchanalia, debauch, debauchery, drunken revelry, orgy, riot, saturnalia |
| (noun) someone who engages in drinking bouts | Synonyms: bacchant, drunken reveler, drunken reveller |
| (noun) a drunken reveller; a devotee of Bacchus | Synonyms: bacchant |
| bacchanalia | (noun) a wild gathering involving excessive drinking and promiscuity | Synonyms: bacchanal, debauch, debauchery, drunken revelry, orgy, riot, saturnalia |
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| bacchanalian | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanal, bacchic, carousing, orgiastic |
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| badinage | (noun) frivolous banter | - |
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| ballerina | (noun) a female ballet dancer | Synonyms: danseuse |
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| banal | (adjective) repeated too often; overfamiliar through overuse | Synonyms: commonplace, hackneyed, old-hat, shopworn, stock, threadbare, timeworn, tired, trite, well-worn |
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| banality | (noun) a trite or obvious remark | Synonyms: bromide, cliche, commonplace, platitude |
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| banana | (noun) elongated crescent-shaped yellow fruit with soft sweet flesh | - |
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| (noun) any of several tropical and subtropical treelike herbs of the genus Musa having a terminal crown of large entire leaves and usually bearing hanging clusters of elongated fruits | Synonyms: banana tree |
| banausic | (adjective) (formal) ordinary and not refined | - |
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| bandana | (noun) large and brightly colored handkerchief; often used as a neckerchief | Synonyms: bandanna |
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| bandanna | (noun) large and brightly colored handkerchief; often used as a neckerchief | Synonyms: bandana |
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| barnacle | (noun) marine crustaceans with feathery food-catching appendages; free-swimming as larvae; as adults form a hard shell and live attached to submerged surfaces | Synonyms: cirriped, cirripede |
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| (noun) European goose smaller than the brant; breeds in the far north | Synonyms: barnacle goose, Branta leucopsis |
| baronage | (noun) the peers of a kingdom considered as a group | Synonyms: peerage |
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| basinal | (adjective) of or relating to a basin | - |
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| bastinado | (noun) a form of torture in which the soles of the feet are beaten with whips or cudgels | Synonyms: falanga |
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| (noun) a cudgel used to give someone a beating on the soles of the feet | - |
| (verb) beat somebody on the soles of the feet | - |
| bastnaesite | (noun) a yellow-to-brown mineral that is a source of rare earth elements | Synonyms: bastnasite |
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| bastnasite | (noun) a yellow-to-brown mineral that is a source of rare earth elements | Synonyms: bastnaesite |
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| bearnaise | (noun) a sauce like hollandaise but made with white wine and tarragon and shallots instead of lemon juice | - |
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| belladonna | (noun) an alkaloidal extract or tincture of the poisonous belladonna plant that is used medicinally | - |
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| (noun) perennial Eurasian herb with reddish bell-shaped flowers and shining black berries; extensively grown in United States; roots and leaves yield atropine | Synonyms: Atropa belladonna, belladonna plant, deadly nightshade |
| benignancy | (noun) the quality of being kind and gentle | Synonyms: benignity, graciousness |
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| benignant | (adjective) pleasant and beneficial in nature or influence | Synonyms: benign |
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| (adjective) characterized by kindness and warm courtesy especially of a king to his subjects | Synonyms: gracious |
| benignantly | (adverb) in a benign manner | Synonyms: benignly |
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| bicarbonate | (noun) a salt of carbonic acid (containing the anion HCO3) in which one hydrogen atom has been replaced; an acid carbonate | Synonyms: hydrogen carbonate |
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| bicentenary | (adjective) of or relating to or completing a period of 200 years | Synonyms: bicentennial |
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| (noun) the 200th anniversary (or the celebration of it) | Synonyms: bicentennial |
| bicornate | (adjective) having two horns or horn-shaped parts | Synonyms: bicorn, bicorned, bicornuate, bicornuous |
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| bidirectional | (adjective) reactive or functioning or allowing movement in two usually opposite directions | - |
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| bigeminal | (adjective) occurring in pairs | - |
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| billionaire | (noun) a very rich person whose material wealth is valued at more than a billion dollars | - |
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| bimillenary | (noun) a span of 2000 years | Synonyms: bimillennium |
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| (noun) the 2000th anniversary (or the celebration of it) | Synonyms: bimillennium |
| binary | (adjective) of or pertaining to a number system have 2 as its base | - |
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| (adjective) consisting of two (units or components or elements or terms) | - |
| (noun) a pre-compiled, pre-linked program that is ready to run under a given operating system; a binary for one operating system will not run on a different operating system | Synonyms: binary program |
| (noun) a system of two stars that revolve around each other under their mutual gravitation | Synonyms: binary star, double star |
| binate | (adjective) growing in two parts or in pairs | - |
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| binaural | (adjective) relating to or having or hearing with two ears | Synonyms: biaural |
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| binaurally | (adverb) in a binaural manner | Synonyms: in both ears, to both ears |
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| binnacle | (noun) a nonmagnetic housing for a ship's compass (usually in front of the helm) | - |
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| binominal | (adjective) having or characterized by two names, especially those of genus and species in taxonomies | Synonyms: binomial |
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| biodynamics | (noun) the branch of biology dealing with energy or the activity of living organisms. | - |
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| bipinnate | (adjective) of a leaf shape; having doubly pinnate leaflets (as ferns) | - |
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| bipinnatifid | (adjective) pinnatifid with the segments also pinnatifid | - |
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| bisectional | (adjective) of or relating to bisection | - |
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| bizonal | (adjective) relating to or concerned with the combined affairs of two administrative zones | - |
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| blacksnake | (noun) blackish racer of the eastern United States that grows to six feet | Synonyms: black racer, Coluber constrictor |
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| (noun) large harmless shiny black North American snake | Synonyms: black rat snake, Elaphe obsoleta, mountain blacksnake, pilot blacksnake |
| bologna | (noun) large smooth-textured smoked sausage of beef and veal and pork | Synonyms: Bologna sausage |
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| bombinate | (verb) make a buzzing sound | Synonyms: bombilate, buzz |
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| bombination | (noun) sound of rapid vibration | Synonyms: bombilation, buzz |
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| bonanza | (noun) a sudden happening that brings good fortune (as a sudden opportunity to make money) | Synonyms: boom, bunce, godsend, gold rush, gravy, manna from heaven, windfall |
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| (noun) an especially rich vein of precious ore | - |
| bonavist | (noun) perennial twining vine of Old World tropics having trifoliate leaves and racemes of fragrant purple pea-like flowers followed by maroon pods of edible seeds; grown as an ornamental and as a vegetable on the Indian subcontinent; sometimes placed in genus Dolichos | Synonyms: Dolichos lablab, Egyptian bean, hyacinth bean, Indian bean, Lablab purpureus |
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| botulinal | (adjective) of or relating to or produced by the botulinus | - |
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| brandysnap | (noun) a gingersnap flavored with brandy | - |
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| brominate | (verb) treat with bromine | Synonyms: bromate |
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| (verb) react with bromine | Synonyms: bromate |
| buna | (noun) made by polymerizing butadiene | Synonyms: buna rubber |
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| burnability | (noun) the quality of being capable of igniting and burning | Synonyms: combustibility, combustibleness |
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| burnable | (adjective) capable of burning | Synonyms: ignitable, ignitible |
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| byname | (noun) a familiar name for a person (often a shortened version of a person's given name) | Synonyms: cognomen, moniker, nickname, sobriquet, soubriquet |
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| cabana | (noun) a small tent used as a dressing room beside the sea or a swimming pool | - |
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| cachinnate | (verb) laugh loudly and in an unrestrained way | - |
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| cachinnation | (noun) loud convulsive laughter | - |
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| cacuminal | (adjective) pronounced with the tip of the tongue turned back toward the hard palate | Synonyms: retroflex |
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| calcination | (noun) the conversion of metals into their oxides as a result of heating to a high temperature | - |
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| calycinal | (adjective) of or relating to or resembling a calyx | Synonyms: calyceal, calycine |
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| campana | (noun) the shape of a bell | Synonyms: bell, bell shape |
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| canafistola | (noun) deciduous or semi-evergreen tree having scented sepia to yellow flowers in drooping racemes and pods whose pulp is used medicinally; tropical Asia and Central and South America and Australia | Synonyms: canafistula, Cassia fistula, drumstick tree, golden shower tree, pudding pipe tree, purging cassia |
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| canafistula | (noun) deciduous or semi-evergreen tree having scented sepia to yellow flowers in drooping racemes and pods whose pulp is used medicinally; tropical Asia and Central and South America and Australia | Synonyms: canafistola, Cassia fistula, drumstick tree, golden shower tree, pudding pipe tree, purging cassia |
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| canal | (noun) long and narrow strip of water made for boats or for irrigation | - |
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| (noun) a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance | Synonyms: channel, duct, epithelial duct |
| (noun) (astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion | - |
| (verb) provide (a city) with a canal | Synonyms: canalise, canalize |
| canalicular | (adjective) relating to or like or having a canaliculus | - |
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| canaliculate | (adjective) having thin parallel channels | - |
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| canaliculus | (noun) a small canal or duct as in some bones and parts of plants | - |
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| canalisation | (noun) the production of a canal or a conversion to canals | Synonyms: canalization |
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| (noun) management through specified channels of communication | Synonyms: canalization, channelisation, channelization |
| canalise | (verb) provide (a city) with a canal | Synonyms: canal, canalize |
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| canalization | (noun) the production of a canal or a conversion to canals | Synonyms: canalisation |
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| (noun) management through specified channels of communication | Synonyms: canalisation, channelisation, channelization |
| canalize | (verb) provide (a city) with a canal | Synonyms: canal, canalise |
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| canape | (noun) an appetizer consisting usually of a thin slice of bread or toast spread with caviar or cheese or other savory food | - |
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| canard | (noun) a deliberately misleading fabrication | - |
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| canary | (adjective) having the color of a canary; of a light to moderate yellow | Synonyms: canary-yellow |
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| (noun) any of several small Old World finches | Synonyms: canary bird |
| (noun) a moderate yellow with a greenish tinge | Synonyms: canary yellow |
| (noun) a female singer | - |
| (noun) someone acting as an informer or decoy for the police | Synonyms: fink, sneak, sneaker, snitch, snitcher, stool pigeon, stoolie, stoolpigeon |
| canasta | (noun) a form of rummy using two decks of cards and four jokers; jokers and deuces are wild; the object is to form groups of the same rank | Synonyms: basket rummy, meld |
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| canavanine | (noun) an amino acid found in the jack bean | - |
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| canna | (noun) any plant of the genus Canna having large sheathing leaves and clusters of large showy flowers | - |
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| cannabin | (noun) a resin obtained from the hemp plant; thought to be the active narcotic agent in marijuana | Synonyms: cannabis resin |
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| cannabis | (noun) the most commonly used illicit drug; considered a soft drug, it consists of the dried leaves of the hemp plant; smoked or chewed for euphoric effect | Synonyms: ganja, marihuana, marijuana |
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| (noun) any plant of the genus Cannabis; a coarse bushy annual with palmate leaves and clusters of small green flowers; yields tough fibers and narcotic drugs | Synonyms: hemp |
| cannonade | (noun) intense and continuous artillery fire | Synonyms: drumfire |
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| (verb) attack with cannons or artillery | - |
| cantonal | (adjective) of or relating to a canton | - |
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| caragana | (noun) any plant of the genus Caragana having even-pinnate leaves and mostly yellow flowers followed by seeds in a linear pod | Synonyms: pea tree |
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| carbonaceous | (adjective) relating to or consisting of or yielding carbon | Synonyms: carbonic, carboniferous, carbonous |
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| carbonado | (noun) a piece of meat (or fish) that has been scored and broiled | - |
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| (noun) an inferior dark diamond used in industry for drilling and polishing | Synonyms: black diamond |
| carbonara | (noun) sauce for pasta; contains eggs and bacon or ham and grated cheese | - |
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| carbonate | (noun) a salt or ester of carbonic acid (containing the anion CO3) | - |
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| (verb) treat with carbon dioxide | - |
| (verb) turn into a carbonate | - |
| carbonated | (adjective) having carbonation (especially artificially carbonated) | - |
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| carbonation | (noun) saturation with carbon dioxide (as soda water) | - |
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| carbonator | (noun) a device that carries out carbonation. | Synonyms: soda carbonator, soda maker |
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| cardinal | (adjective) being or denoting a numerical quantity but not order | - |
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| (adjective) serving as an essential component | Synonyms: central, fundamental, key, primal |
| (noun) crested thick-billed North American finch having bright red plumage in the male | Synonyms: cardinal grosbeak, Cardinalis cardinalis, redbird, Richmondena Cardinalis |
| (noun) a variable color averaging a vivid red | Synonyms: carmine |
| (noun) (Roman Catholic Church) one of a group of more than 100 prominent bishops in the Sacred College who advise the Pope and elect new Popes | - |
| (noun) the number of elements in a mathematical set; denotes a quantity but not the order | Synonyms: cardinal number |
| cardinalate | (noun) the office of cardinal | Synonyms: cardinalship |
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| (noun) (Roman Catholic Church) the body of all cardinals of the church; elects and advises the pope | Synonyms: College of Cardinals, Sacred College, Sacred College of Cardinals |
| cardinalfish | (noun) small red fishes of coral reefs and inshore tropical waters | - |
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| cardinality | (noun) (mathematics) the number of elements in a set or group (considered as a property of that grouping) | - |
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| cardinalship | (noun) the office of cardinal | Synonyms: cardinalate |
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| cardiopulmonary | (adjective) of or pertaining to or affecting both the heart and the lungs and their functions | Synonyms: cardiorespiratory |
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| carina | (noun) any of various keel-shaped structures or ridges such as that on the breastbone of a bird or that formed by the fused petals of a pea blossom | - |
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| carinal | (adjective) relating to or resembling a carina | - |
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| carinate | (adjective) having a ridge or shaped like a ridge or suggesting the keel of a ship | Synonyms: carinated, keeled, ridged |
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| (noun) birds having keeled breastbones for attachment of flight muscles | Synonyms: carinate bird, flying bird |
| carinated | (adjective) having a ridge or shaped like a ridge or suggesting the keel of a ship | Synonyms: carinate, keeled, ridged |
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| carminative | (adjective) relieving gas in the alimentary tract (colic or flatulence or griping) | Synonyms: flatus-relieving |
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| (noun) medication that prevents the formation of gas in the alimentary tract or eases its passing | - |