| authoritative | (adjective) endowed with authority | Synonyms: authorised, authorized |
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| (adjective) having authority or ascendancy or influence | Synonyms: important |
| (adjective) of recognized authority or excellence | Synonyms: definitive |
| authoritatively | (adverb) in an authoritative and magisterial manner | Synonyms: magisterially |
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| autocatalysis | (noun) catalysis in which the catalyst is one of the products of the reaction | - |
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| autocatalytic | (adjective) relating to or proceeding by autocatalysis | - |
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| avatar | (noun) the manifestation of a Hindu deity (especially Vishnu) in human or superhuman or animal form | - |
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| (noun) a new personification of a familiar idea | Synonyms: embodiment, incarnation |
| aventail | (noun) a medieval hood of mail suspended from a basinet to protect the head and neck | Synonyms: camail, ventail |
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| avertable | (adjective) capable of being avoided or warded off | Synonyms: avertible, avoidable, evitable |
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| avitaminosis | (noun) any of several diseases caused by deficiency of one or more vitamins | Synonyms: hypovitaminosis |
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| avitaminotic | (adjective) of or relating to or characteristic of avitaminosis | - |
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| azotaemia | (noun) accumulation in the blood of nitrogenous waste products (urea) that are usually excreted in the urine | Synonyms: azotemia, uraemia, uremia |
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| babytalk | (noun) the developing speech of a young child | Synonyms: baby talk |
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| (noun) an adult's imitation of the speech of a young child | Synonyms: baby talk, motherese |
| backstage | (adjective) concealed from public view or attention | Synonyms: offstage |
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| (noun) a stage area out of sight of the audience | Synonyms: offstage, wing |
| (adverb) in or to a backstage area of a theater | - |
| (adverb) out of view of the public; behind the scenes | - |
| backstair | (adjective) secret and sly or sordid | Synonyms: backstairs, furtive |
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| backstairs | (adjective) secret and sly or sordid | Synonyms: backstair, furtive |
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| (noun) a second staircase at the rear of a building | - |
| backstay | (noun) a stay that supports the back of something | - |
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| backtalk | (noun) an impudent or insolent rejoinder | Synonyms: back talk, lip, mouth, sass, sassing |
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| bacteriostasis | (noun) inhibition of the growth of bacteria | - |
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| bacteriostat | (noun) a chemical or biological material that inhibits bacterial growth | - |
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| bacteriostatic | (adjective) of or relating to or causing bacteriostasis | - |
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| balata | (noun) a tropical hardwood tree yielding balata gum and heavy red timber | Synonyms: balata tree, beefwood, bully tree, Manilkara bidentata |
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| (noun) when dried yields a hard substance used e.g. in golf balls | Synonyms: gutta balata |
| ballista | (noun) ancient missile weapon that throws bolts or stones | Synonyms: bolt thrower |
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| bandstand | (noun) a platform where a (brass) band can play in the open air | Synonyms: outdoor stage, stand |
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| bandtail | (noun) wild pigeon of western North America; often mistaken for the now extinct passenger pigeon | Synonyms: band-tail pigeon, band-tailed pigeon, Columba fasciata |
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| bangtail | (noun) a horse bred for racing | Synonyms: race horse, racehorse |
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| bantam | (adjective) very small | Synonyms: diminutive, flyspeck, lilliputian, midget, petite, tiny |
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| (noun) any of various small breeds of fowl | - |
| bantamweight | (noun) A weight class division in combat sports, for fighters heavier than those in the flyweight division and lighter than those in the featherweight division. | - |
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| (noun) an amateur boxer who weighs no more than 119 pounds | - |
| (noun) weighs 115-126 pounds | - |
| barbital | (noun) a barbiturate used as a hypnotic | Synonyms: barbitone, diethylbarbituric acid, diethylmalonylurea, veronal |
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| baronetage | (noun) the state of a baronet | - |
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| (noun) the collective body of baronets | - |
| barracouta | (noun) a large marine food fish common on the coasts of Australia, New Zealand, and southern Africa | Synonyms: snoek |
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| baryta | (noun) any of several compounds of barium | - |
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| basipetal | (adjective) of leaves or flowers; developing or opening in succession from apex to base | - |
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| bastard | (adjective) fraudulent; having a misleading appearance | Synonyms: bogus, fake, phoney, phony |
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| (noun) derogatory term for a variation that is not genuine; something irregular or inferior or of dubious origin | Synonyms: mongrel |
| (noun) insulting terms of address for people who are stupid or irritating or ridiculous | Synonyms: asshole, cocksucker, dickhead, mother fucker, motherfucker, prick, shit, SOB, son of a bitch, whoreson |
| (noun) the illegitimate offspring of unmarried parents | Synonyms: by-blow, illegitimate, illegitimate child, love child, whoreson |
| bastardisation | (noun) an act that debases or corrupts | Synonyms: bastardization |
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| bastardise | (verb) declare a child to be illegitimate | Synonyms: bastardize |
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| (verb) change something so that its value declines; for example, art forms | Synonyms: bastardize |
| bastardised | (adjective) deriving from more than one source or style | Synonyms: bastardized |
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| bastardization | (noun) an act that debases or corrupts | Synonyms: bastardisation |
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| (noun) declaring or rendering bastard | - |
| bastardize | (verb) declare a child to be illegitimate | Synonyms: bastardise |
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| (verb) change something so that its value declines; for example, art forms | Synonyms: bastardise |
| bastardized | (adjective) deriving from more than one source or style | Synonyms: bastardised |
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| bastardly | (adjective) of no value or worth | Synonyms: mean |
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| (adjective) born out of wedlock | Synonyms: misbegot, misbegotten, spurious |
| bastardy | (noun) the status of being born to parents who were not married | Synonyms: bar sinister, illegitimacy |
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| battalion | (noun) an army unit usually consisting of a headquarters and three or more companies | - |
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| (noun) a large indefinite quantity | Synonyms: large number, multitude, pack, plurality |
| beanstalk | (noun) stem of a bean plant | - |
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| beatable | (adjective) susceptible to being defeated | Synonyms: vanquishable, vincible |
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| berretta | (noun) a stiff cap with ridges across the crown; worn by Roman Catholic clergy | Synonyms: biretta, birretta |
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| bespectacled | (adjective) wearing, or having the face adorned with, eyeglasses or an eyeglass | Synonyms: monocled, spectacled |
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| beta | (adjective) preliminary or testing stage of a software or hardware product | - |
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| (adjective) second in order of importance | - |
| (noun) the 2nd letter of the Greek alphabet | - |
| betaine | (noun) a sweet tasting alkaloid that occurs in sugar beets | - |
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| betatron | (noun) accelerates a continuous beam of electrons to high speeds by means of the electric field produced by changing magnetic flux | Synonyms: induction accelerator |
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| bicipital | (adjective) having two heads or points of origin as a biceps | - |
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| bidentate | (adjective) having toothlike projections that are themselves toothed | - |
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| bimetal | (adjective) formed of two different metals or alloys; especially in sheets bonded together | Synonyms: bimetallic |
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| (noun) material made by bonding together sheets of two different metals | - |
| bimetallic | (adjective) pertaining to a monetary system based on two metals | Synonyms: bimetallistic |
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| (adjective) formed of two different metals or alloys; especially in sheets bonded together | Synonyms: bimetal |
| bimetallism | (noun) a monetary standard under which the basic unit of currency is defined by stated amounts of two metals (usually gold and silver) with values set at a predetermined ratio | - |
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| bimetallist | (noun) an advocate of bimetallism | - |
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| bimetallistic | (adjective) pertaining to a monetary system based on two metals | Synonyms: bimetallic |
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| bioattack | (noun) the use of bacteria or viruses or toxins to destroy men and animals or food | Synonyms: biologic attack, biological attack, biological warfare, BW |
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| biocatalyst | (noun) a biochemical catalyst such as an enzyme | - |
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| biocatalytic | (adjective) of or relating to biocatalysts | - |
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| biostatistics | (noun) a branch of biology that studies biological phenomena and observations by means of statistical analysis | Synonyms: biometrics, biometry |
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| biota | (noun) all the plant and animal life of a particular region | Synonyms: biology |
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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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| birretta | (noun) a stiff cap with ridges across the crown; worn by Roman Catholic clergy | Synonyms: berretta, biretta |
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| bitartrate | (noun) an acid tartrate; a hydrogen tartrate | - |
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| blacktail | (noun) mule deer of western Rocky Mountains | Synonyms: black-tailed deer, blacktail deer, Odocoileus hemionus columbianus |
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| blatancy | (noun) the property of being both obvious and offensive | - |
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| blatant | (adjective) conspicuously and offensively loud; given to vehement outcry | Synonyms: clamant, clamorous, strident, vociferous |
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| (adjective) without any attempt at concealment; completely obvious | Synonyms: blazing, conspicuous |
| blatantly | (adverb) in a blatant manner | - |
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| blaxploitation | (noun) the exploitation of black people (especially with regard to stereotyped roles in movies) | - |
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| bloodstain | (noun) a discoloration caused by blood | - |
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| bloodstained | (adjective) covered with blood | Synonyms: gory |
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| bobtail | (adjective) having a short or shortened tail | Synonyms: bobtailed |
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| (noun) a short or shortened tail of certain animals | Synonyms: bob, dock |
| (noun) large sheepdog with a profuse shaggy bluish-grey-and-white coat and short tail; believed to trace back to the Roman occupation of Britain | Synonyms: Old English sheepdog |
| bobtailed | (adjective) having a short or shortened tail | Synonyms: bobtail |
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| bookstall | (noun) a shop where books are sold | Synonyms: bookshop, bookstore |
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| borstal | (noun) formerly a British reform school for youths considered too young to send to prison | - |
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| bota | (noun) a wine bottle made of leather | - |
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| botanic | (adjective) of or relating to plants or botany | Synonyms: botanical |
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| botanical | (adjective) of or relating to plants or botany | Synonyms: botanic |
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| (noun) a drug made from part of a plant (as the bark or root or leaves) | - |
| botanise | (verb) collect and study plants | Synonyms: botanize |
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| botanist | (noun) a biologist specializing in the study of plants | Synonyms: phytologist, plant scientist |
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| botanize | (verb) collect and study plants | Synonyms: botanise |
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| botany | (noun) the branch of biology that studies plants | Synonyms: phytology |
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| (noun) all the plant life in a particular region or period | Synonyms: flora, vegetation |
| breathtaking | (adjective) tending to cause suspension of regular breathing | Synonyms: breathless |
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| bristletail | (noun) small wingless insect with a long bristlelike tail | - |
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| broadtail | (noun) hardy coarse-haired sheep of central Asia; lambs are valued for their soft curly black fur | Synonyms: caracul, karakul |
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| (noun) the fur of a very young karakul lamb | - |
| browntail | (noun) small brown and white European moth introduced into eastern United States; pest of various shade and fruit trees | Synonyms: brown-tail moth, Euproctis phaeorrhoea |
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| brutal | (adjective) disagreeably direct and precise | - |
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| (adjective) resembling a beast; showing lack of human sensibility | Synonyms: beastly, bestial, brute, brutish |
| (adjective) punishingly harsh | Synonyms: unrelenting |
| (adjective) (of persons or their actions) able or disposed to inflict pain or suffering | Synonyms: barbarous, cruel, fell, roughshod, savage, vicious |
| brutalisation | (noun) an act that makes people cruel or lacking normal human qualities | Synonyms: animalisation, animalization, brutalization |
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| (noun) the activity of treating someone savagely or viciously | Synonyms: brutalization |
| (noun) the condition of being treated in a cruel and savage manner | Synonyms: brutalization |
| brutalise | (verb) become brutal or insensitive and unfeeling | Synonyms: animalise, animalize, brutalize |
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| (verb) make brutal, unfeeling, or inhuman | Synonyms: animalise, animalize, brutalize |
| (verb) treat brutally | Synonyms: brutalize |
| brutality | (noun) a brutal barbarous savage act | Synonyms: barbarism, barbarity, savagery |
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| (noun) the trait of extreme cruelty | Synonyms: ferociousness, savagery, viciousness |
| brutalization | (noun) an act that makes people cruel or lacking normal human qualities | Synonyms: animalisation, animalization, brutalisation |
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| (noun) the activity of treating someone savagely or viciously | Synonyms: brutalisation |
| (noun) the condition of being treated in a cruel and savage manner | Synonyms: brutalisation |
| brutalize | (verb) become brutal or insensitive and unfeeling | Synonyms: animalise, animalize, brutalise |
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| (verb) make brutal, unfeeling, or inhuman | Synonyms: animalise, animalize, brutalise |
| (verb) treat brutally | Synonyms: brutalise |
| brutally | (adverb) in a vicious manner | Synonyms: savagely, viciously |
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| budgetary | (adjective) of or relating to a budget | - |
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| buntal | (noun) fine white Philippine fiber from stalks of unopened leaves of talipot palms; used in making hats | - |
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| bustard | (noun) large heavy-bodied chiefly terrestrial game bird capable of powerful swift flight; classified with wading birds but frequents grassy steppes | - |
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| 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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