| benevolent | (adjective) intending or showing kindness | - |
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| (adjective) generous in assistance to the poor | Synonyms: beneficent, eleemosynary, philanthropic |
| (adjective) generous in providing aid to others | Synonyms: freehearted |
| (adjective) showing or motivated by sympathy and understanding and generosity | Synonyms: charitable, good-hearted, kindly, large-hearted, openhearted, sympathetic |
| benevolently | (adverb) in a benevolent manner | - |
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| benzol | (noun) a colorless liquid hydrocarbon; highly flammable; carcinogenic; the simplest of the aromatic compounds | Synonyms: benzene, benzine |
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| bibliolatrous | (adjective) given to Bible-worship | - |
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| bibliolatry | (noun) the worship of the Bible | Synonyms: Bible-worship |
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| bibliopole | (noun) a dealer in secondhand books (especially rare or curious books) | Synonyms: bibliopolist |
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| bibliopolic | (adjective) of or relating to bibliopoles | - |
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| bibliopolist | (noun) a dealer in secondhand books (especially rare or curious books) | Synonyms: bibliopole |
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| bicolor | (adjective) having two colors | Synonyms: bichrome, bicolored, bicolour, bicoloured, dichromatic |
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| bicolored | (adjective) having two colors | Synonyms: bichrome, bicolor, bicolour, bicoloured, dichromatic |
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| bicolour | (adjective) having two colors | Synonyms: bichrome, bicolor, bicolored, bicoloured, dichromatic |
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| bicoloured | (adjective) having two colors | Synonyms: bichrome, bicolor, bicolored, bicolour, dichromatic |
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| bifoliate | (adjective) having two leaves | - |
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| billfold | (noun) a pocket-size case for holding papers and paper money | Synonyms: notecase, pocketbook, wallet |
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| bimolecular | (adjective) relating to or affecting two molecules | - |
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| bioclimatology | (noun) the study of effects of climate on living organisms | - |
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| biologic | (adjective) pertaining to biology or to life and living things | Synonyms: biological |
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| biological | (adjective) (of a parent or child) related by blood; genetically related | Synonyms: natural |
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| (adjective) pertaining to biology or to life and living things | Synonyms: biologic |
| biologically | (adverb) with respect to biology | - |
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| biologism | (noun) use of biological principles in explaining human especially social behavior | - |
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| biologist | (noun) (biology) a scientist who studies living organisms | Synonyms: life scientist |
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| biologistic | (adjective) of or relating to biologism | - |
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| biology | (noun) the science that studies living organisms | Synonyms: biological science |
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| (noun) all the plant and animal life of a particular region | Synonyms: biota |
| (noun) characteristic life processes and phenomena of living organisms | - |
| bioluminescence | (noun) luminescence produced by physiological processes (as in the firefly) | - |
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| bioluminescent | (adjective) (of living organisms) emitting light | - |
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| biotechnology | (noun) the branch of engineering science in which biological science is used to study the relation between workers and their environments | Synonyms: bioengineering, ergonomics |
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| (noun) the branch of molecular biology that studies the use of microorganisms to perform specific industrial processes | Synonyms: biotech |
| bipolar | (adjective) having two poles | - |
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| (adjective) of, pertaining to, or occurring in both polar regions | - |
| (adjective) of or relating to manic depressive illness | - |
| blackpoll | (noun) North American warbler having a black-and-white head | Synonyms: Dendroica striate |
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| blindfold | (adjective) wearing a blindfold | Synonyms: blindfolded |
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| (noun) a cloth used to cover the eyes | - |
| (verb) cover the eyes of (someone) to prevent him from seeing | - |
| blindfolded | (adjective) wearing a blindfold | Synonyms: blindfold |
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| blolly | (noun) evergreen climbing shrub of southern Florida and West Indies grown for its racemes of fragrant white to creamy flowers followed by globose white succulent berries | Synonyms: Chiococca alba, West Indian snowberry |
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| blowhole | (noun) a hole for the escape of gas or air | Synonyms: vent-hole, vent, venthole |
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| (noun) the spiracle of a cetacean located far back on the skull | - |
| bobolink | (noun) migratory American songbird | Synonyms: Dolichonyx oryzivorus, reedbird, ricebird |
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| bola | (noun) a rope with weights attached to the ends; is thrown to entangle the legs of an animal; of South American origin | - |
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| (noun) a cord fastened around the neck with an ornamental clasp and worn as a necktie | Synonyms: bola tie, bolo, bolo tie |
| bold | (adjective) fearless and daring | - |
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| (adjective) clear and distinct | - |
| (adjective) very steep; having a prominent and almost vertical front | Synonyms: bluff, sheer |
| (noun) a typeface with thick heavy lines | Synonyms: bold face, boldface |
| boldface | (noun) a typeface with thick heavy lines | Synonyms: bold, bold face |
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| (verb) print in boldface | - |
| boldly | (adverb) with boldness, in a bold manner | - |
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| boldness | (noun) the trait of being willing to undertake things that involve risk or danger | Synonyms: daring, hardihood, hardiness |
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| (noun) the quality of standing out strongly and distinctly | Synonyms: strikingness |
| (noun) impudent aggressiveness | Synonyms: brass, cheek, face, nerve |
| bole | (noun) the main stem of a tree; usually covered with bark; the bole is usually the part that is commercially useful for lumber | Synonyms: tree trunk, trunk |
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| (noun) a soft oily clay used as a pigment (especially a reddish brown pigment) | - |
| bolero | (noun) a Spanish dance in triple time accompanied by guitar and castanets | - |
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| (noun) a short jacket; worn mostly by women | - |
| (noun) music written in the rhythm of the bolero dance | - |
| bolete | (noun) any fungus of the family Boletaceae | - |
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| bolide | (noun) an especially luminous meteor (sometimes exploding) | Synonyms: fireball |
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| bolivar | (noun) the basic unit of money in Venezuela; equal to 100 centimos | - |
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| bolivia | (noun) a form of canasta in which sequences can be melded | - |
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| boliviano | (noun) the basic unit of money in Bolivia; equal to 100 centavos | - |
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| boll | (noun) the rounded seed-bearing capsule of a cotton or flax plant | - |
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| bollard | (noun) a strong post (as on a wharf or quay or ship for attaching mooring lines) | Synonyms: bitt |
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| bollix | (verb) make a mess of, destroy or ruin | Synonyms: ball up, blow, bobble, bodge, bollix up, bollocks, bollocks up, botch, botch up, bumble, bungle, flub, fluff, foul up, fuck up, fumble, louse up, mess up, mishandle, muck up, muff, screw up, spoil |
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| bollock | (noun) a pulley-block at the head of a topmast | Synonyms: bullock block |
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| (noun) one of the two male reproductive glands that produce spermatozoa and secrete androgens | Synonyms: ball, ballock, egg, nut, orchis, testicle, testis |
| bollocks | (verb) make a mess of, destroy or ruin | Synonyms: ball up, blow, bobble, bodge, bollix, bollix up, bollocks up, botch, botch up, bumble, bungle, flub, fluff, foul up, fuck up, fumble, louse up, mess up, mishandle, muck up, muff, screw up, spoil |
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| bollworm | (noun) any of various moth caterpillars that destroy cotton bolls | - |
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| bolo | (noun) long heavy knife with a single edge; of Philippine origin | Synonyms: bolo knife |
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| (noun) a cord fastened around the neck with an ornamental clasp and worn as a necktie | Synonyms: bola, bola tie, bolo tie |
| bologna | (noun) large smooth-textured smoked sausage of beef and veal and pork | Synonyms: Bologna sausage |
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| bologram | (noun) record or recording made by a bolometer | Synonyms: bolograph |
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| bolograph | (noun) record or recording made by a bolometer | Synonyms: bologram |
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| bolographic | (adjective) of or relating to a bolograph | - |
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| bolometer | (noun) an instrument that measures heat radiation; extremely sensitive | - |
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| bolometric | (adjective) of or relating to a bolometer | - |
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| boloney | (noun) pretentious or silly talk or writing | Synonyms: baloney, bilgewater, bosh, drool, humbug, taradiddle, tarradiddle, tommyrot, tosh, twaddle |
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| bolshevise | (verb) make Communist or bring in accord with Communist principles | Synonyms: bolshevize, communise, communize |
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| bolshevize | (verb) make Communist or bring in accord with Communist principles | Synonyms: bolshevise, communise, communize |
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| bolshie | (noun) emotionally charged terms used to refer to extreme radicals or revolutionaries | Synonyms: Bolshevik, bolshy, Marxist, red |
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| bolshy | (adjective) obstreperous | Synonyms: stroppy |
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| (noun) emotionally charged terms used to refer to extreme radicals or revolutionaries | Synonyms: Bolshevik, bolshie, Marxist, red |
| bolster | (noun) a pillow that is often put across a bed underneath the regular pillows | Synonyms: long pillow |
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| (verb) add padding to | Synonyms: pad |
| (verb) support and strengthen | Synonyms: bolster up |
| (verb) prop up with a pillow or bolster | - |
| bolt | (noun) a sudden abandonment (as from a political party) | - |
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| (noun) the act of moving with great haste | Synonyms: dash |
| (noun) a screw that screws into a nut to form a fastener | - |
| (noun) the part of a lock that is engaged or withdrawn with a key | Synonyms: deadbolt |
| (noun) a sliding bar in a breech-loading firearm that ejects an empty cartridge and replaces it and closes the breech | - |
| (noun) a roll of cloth or wallpaper of a definite length | - |
| (noun) a discharge of lightning accompanied by thunder | Synonyms: bolt of lightning, thunderbolt |
| (adverb) directly | Synonyms: bang, slap, slapdash, smack |
| (adverb) in a rigid manner | Synonyms: rigidly, stiffly |
| (verb) make or roll into bolts | - |
| (verb) eat hastily without proper chewing | Synonyms: gobble |
| (verb) swallow hastily | - |
| (verb) secure or lock with a bolt | - |
| (verb) move or jump suddenly | - |
| (verb) leave suddenly and as if in a hurry | Synonyms: beetle off, bolt out, run off, run out |
| (verb) run away; usually includes taking something or somebody along | Synonyms: abscond, absquatulate, decamp, go off, make off, run off |
| bolti | (noun) important food fish of the Nile and other rivers of Africa and Asia Minor | Synonyms: Tilapia nilotica |
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| bolus | (noun) a large pill; used especially in veterinary medicine | - |
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| (noun) a small round soft mass (as of chewed food) | - |
| bondholder | (noun) a holder of bonds issued by a government or corporation | - |
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| borecole | (noun) a hardy cabbage with coarse curly leaves that do not form a head | Synonyms: Brassica oleracea acephala, cole, colewort, kail, kale |
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| bracteolate | (adjective) having bracteoles | - |
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| bracteole | (noun) a small bract | Synonyms: bractlet |
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| brassavola | (noun) any of various tropical American orchids with usually solitary fleshy leaves and showy white to green nocturnally fragrant blossoms solitary or in racemes of up to 7 | - |
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| bricolage | (noun) construction of something by whatever material are available | - |
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| bricole | (noun) catapult operated by manpower pulling cords attached to a lever and slign to launch projectiles | Synonyms: mangonel, traction trebuchet |
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| broccoli | (noun) branched green undeveloped flower heads | - |
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| (noun) plant with dense clusters of tight green flower buds | Synonyms: Brassica oleracea italica |
| brolly | (noun) colloquial terms for an umbrella | Synonyms: gamp |
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| bronchiolar | (adjective) of or relating to or involving bronchioles | - |
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| bronchiole | (noun) any of the smallest bronchial ducts; ending in alveoli | - |
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| bronchiolitis | (noun) inflammation of the membranes lining the bronchioles | - |
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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 |
| bugologist | (noun) a zoologist who studies insects | Synonyms: bug-hunter, entomologist |
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| bugology | (noun) the branch of zoology that studies insects | Synonyms: entomology |
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| bunghole | (noun) a hole in a barrel or cask; used to fill or empty it | - |
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| (noun) vulgar slang for anus | Synonyms: arse, arsehole, asshole |
| butanol | (noun) a flammable alcohol derived from butanes and used for solvents | Synonyms: butyl alcohol |
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| buttonhole | (noun) a hole through which buttons are pushed | Synonyms: button hole |
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| (verb) detain in conversation by or as if by holding on to the outer garments of; as for political or economic favors | Synonyms: lobby |
| cabriolet | (noun) small two-wheeled horse-drawn carriage; with two seats and a folding hood | Synonyms: cab |
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| cajole | (verb) influence or urge by gentle urging, caressing, or flattering | Synonyms: blarney, coax, inveigle, palaver, sweet-talk, wheedle |
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| cajolery | (noun) flattery intended to persuade | Synonyms: blandishment, palaver |
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| cajolingly | (adverb) in a cajoling manner | Synonyms: coaxingly |
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| cakehole | (noun) informal terms for the mouth | Synonyms: gob, hole, maw, trap, yap |
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| calceolaria | (noun) any garden plant of the genus Calceolaria having flowers with large inflated slipper-shaped lower lip | Synonyms: slipperwort |
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| calceolate | (adjective) of slipper-shaped blossoms | Synonyms: calceiform |
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| calcicolous | (adjective) growing or living in soil rich in lime | - |
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| calciferol | (noun) a fat-soluble vitamin that prevents rickets | Synonyms: cholecalciferol, D, ergocalciferol, viosterol, vitamin D |
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| camisole | (noun) a short negligee | - |
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| (noun) a short sleeveless undergarment for women | Synonyms: underbodice |
| campstool | (noun) a folding stool | - |
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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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| canola | (noun) vegetable oil made from rapeseed; it is high in monounsaturated fatty acids | Synonyms: canola oil |
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| capitol | (noun) a building occupied by a state legislature | - |
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| capriole | (noun) (dressage) a vertical jump of a trained horse with a kick of the hind legs at the top of the jump | - |
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| (noun) a playful leap or hop | Synonyms: caper |
| (verb) perform a capriole, in ballet | - |
| (verb) perform a capriole, of horses in dressage | - |