| anisotropy | (noun) the property of being anisotropic; having a different value when measured in different directions | - |
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| annihilation | (noun) destruction by annihilating something | Synonyms: obliteration |
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| (noun) total destruction | Synonyms: disintegration |
| annihilator | (noun) a total destroyer | - |
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| anniversary | (noun) the date on which an event occurred in some previous year (or the celebration of it) | Synonyms: day of remembrance |
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| antagonism | (noun) (biochemistry) interference in or inhibition of the physiological action of a chemical substance by another having a similar structure | - |
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| (noun) an actively expressed feeling of dislike and hostility | - |
| (noun) the relation between opposing principles or forces or factors | - |
| (noun) a state of deep-seated ill-will | Synonyms: enmity, hostility |
| antagonist | (noun) a drug that neutralizes or counteracts the effects of another drug | - |
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| (noun) a muscle that relaxes while another contracts | - |
| (noun) someone who offers opposition | Synonyms: adversary, opponent, opposer, resister |
| antiestablishmentarianism | (noun) the doctrine of opposition to the social and political establishment | Synonyms: antiestablishmentism |
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| antifeminism | (noun) activity indicative of belief in the superiority of men over women | Synonyms: chauvinism, male chauvinism |
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| antifeminist | (noun) someone who does not believe in the social or economic or political equality of men and women | - |
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| antinomianism | (noun) the theological doctrine that by faith and God's grace a Christian is freed from all laws (including the moral standards of the culture) | - |
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| antivenin | (noun) an antitoxin that counteracts the effects of venom from the bite of a snake or insect or other animal | Synonyms: antivenene |
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| aphanite | (noun) fine-grained homogeneous rock (such as basalt) containing minerals undetectable by the naked eye | - |
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| aphonia | (noun) a disorder of the vocal organs that results in the loss of voice | Synonyms: voicelessness |
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| apportioning | (noun) the act of distributing by allotting or apportioning; distribution according to a plan | Synonyms: allocation, allotment, apportionment, assignation, parceling, parcelling |
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| arachnid | (noun) air-breathing arthropods characterized by simple eyes and four pairs of legs | Synonyms: arachnoid |
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| aragonite | (noun) a mineral form of crystalline calcium carbonate; dimorphic with calcite | - |
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| archaeornis | (noun) extinct primitive toothed bird with a long feathered tail and three free clawed digits on each wing | - |
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| archegonium | (noun) a female sex organ occurring in mosses, ferns, and most gymnosperms | - |
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| architectonics | (noun) the science of architecture | Synonyms: tectonics |
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| arginine | (noun) a bitter tasting amino acid found in proteins and necessary for nutrition; its absence from the diet leads to a reduced production of spermatozoa | - |
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| arianist | (noun) an adherent of Arianism (the belief that Jesus Christ was not truly God) | - |
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| arnica | (noun) an ointment used in treating bruises | - |
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| (noun) any of various rhizomatous usually perennial plants of the genus Arnica | - |
| (noun) used especially in treating bruises | - |
| arsenic | (noun) a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and in various alloys; found in arsenopyrite and orpiment and realgar | Synonyms: As, atomic number 33 |
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| (noun) a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer | Synonyms: arsenic trioxide, arsenous anhydride, arsenous oxide, ratsbane, white arsenic |
| arsenical | (noun) a pesticide or drug containing arsenic | - |
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| arsenide | (noun) a compound of arsenic with a more positive element | - |
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| arsonist | (noun) a criminal who illegally sets fire to property | Synonyms: firebug, incendiary |
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| asininity | (noun) the quality of being asinine; stupidity combined with stubbornness | - |
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| assigning | (noun) the act of distributing something to designated places or persons | Synonyms: assignment |
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| associationism | (noun) (psychology) a theory that association is the basic principle of mental activity | Synonyms: association theory |
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| asthenia | (noun) an abnormal loss of strength | Synonyms: astheny |
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| astonishment | (noun) the feeling that accompanies something extremely surprising | Synonyms: amazement |
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| asynchronism | (noun) the relation that exists when things occur at unrelated times | Synonyms: asynchrony, desynchronisation, desynchronization, desynchronizing |
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| atonia | (noun) lack of normal muscular tension or tonus | Synonyms: amyotonia, atonicity, atony |
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| atonicity | (noun) lack of normal muscular tension or tonus | Synonyms: amyotonia, atonia, atony |
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| austenite | (noun) a solid solution of ferric carbide or carbon in iron; cools to form pearlite or martensite | - |
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| authoritarianism | (noun) a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.) | Synonyms: absolutism, Caesarism, despotism, dictatorship, monocracy, one-man rule, shogunate, Stalinism, totalitarianism, tyranny |
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| autogenics | (noun) training patients in self-induced relaxation | Synonyms: autogenic therapy, autogenic training |
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| autoimmunity | (noun) production of antibodies against the tissues of your own body; produces autoimmune disease or hypersensitivity reactions | - |
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| avionics | (noun) science and technology of electronic systems and devices for aeronautics and astronautics | - |
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| awakening | (noun) the act of waking | Synonyms: wakening, waking up |
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| awning | (noun) a canopy made of canvas to shelter people or things from rain or sun | Synonyms: sunblind, sunshade |
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| bagnio | (noun) a building where prostitutes are available | Synonyms: bawdyhouse, bordello, brothel, cathouse, house of ill repute, house of prostitution, sporting house, whorehouse |
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| (noun) a building containing public baths | Synonyms: bathhouse |
| balanitis | (noun) inflammation of the head of the penis | - |
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| balletomania | (noun) extraordinary enthusiasm for ballets | - |
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| ballooning | (noun) flying in a balloon | - |
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| balloonist | (noun) someone who flies a balloon | - |
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| banian | (noun) a loose fitting jacket; originally worn in India | Synonyms: banyan |
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| (noun) East Indian tree that puts out aerial shoots that grow down into the soil forming additional trunks | Synonyms: banian tree, banyan, banyan tree, East Indian fig tree, Ficus bengalensis, Indian banyan |
| banishment | (noun) rejection by means of an act of banishing or proscribing someone | Synonyms: proscription |
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| (noun) the state of being banished or ostracized (excluded from society by general consent) | Synonyms: Coventry, ostracism |
| banister | (noun) a railing at the side of a staircase or balcony to prevent people from falling | Synonyms: balusters, balustrade, bannister, handrail |
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| banning | (noun) an official prohibition or edict against something | Synonyms: ban, forbiddance, forbidding |
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| bannister | (noun) a railing at the side of a staircase or balcony to prevent people from falling | Synonyms: balusters, balustrade, banister, handrail |
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| bargaining | (noun) the negotiation of the terms of a transaction or agreement | - |
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| bartonia | (noun) annual grown especially for its fragrant golden nocturnal flowers | Synonyms: Mentzelia lindleyi |
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| bassoonist | (noun) a musician who plays the bassoon | - |
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| beanie | (noun) a small skullcap; formerly worn by schoolboys and college freshmen | Synonyms: beany |
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| beatnik | (noun) a member of the beat generation; a nonconformist in dress and behavior | Synonyms: beat |
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| beatniks | (noun) a United States youth subculture of the 1950s; rejected possessions or regular work or traditional dress; for communal living and psychedelic drugs and anarchism; favored modern forms of jazz (e.g., bebop) | Synonyms: beat generation, beats |
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| beginning | (noun) the act of starting something | Synonyms: commencement, start |
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| (noun) the first part or section of something | - |
| (noun) the event consisting of the start of something | - |
| (noun) the place where something begins, where it springs into being | Synonyms: origin, root, rootage, source |
| (noun) the time at which something is supposed to begin | Synonyms: commencement, first, get-go, kickoff, offset, outset, showtime, start, starting time |
| begonia | (noun) any of numerous plants of the genus Begonia grown for their attractive glossy asymmetrical leaves and colorful flowers in usually terminal cymes or racemes | - |
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| belemnite | (noun) a conical calcareous fossil tapering to a point at one end and with a conical cavity at the other end containing (when unbroken) a small chambered phragmocone from the shell of any of numerous extinct cephalopods of the family Belemnitidae | - |
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| benignancy | (noun) the quality of being kind and gentle | Synonyms: benignity, graciousness |
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| benignity | (noun) a kind act | Synonyms: kindness |
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| (noun) the quality of being kind and gentle | Synonyms: benignancy, graciousness |
| benison | (noun) a spoken blessing | - |
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| benni | (noun) East Indian annual erect herb; source of sesame seed or benniseed and sesame oil | Synonyms: benne, benny, sesame, Sesamum indicum |
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| bennie | (noun) a form of amphetamine | Synonyms: Benzedrine |
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| benniseed | (noun) small oval seeds of the sesame plant | Synonyms: sesame seed |
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| bentonite | (noun) an absorbent aluminum silicate clay formed from volcanic ash | - |
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| benzylpenicillin | (noun) the penicillin that constitutes the principal component of many commercial antibiotics | Synonyms: penicillin G |
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| bergenia | (noun) any plant of the genus Bergenia; valued as an evergreen ground cover and for the spring blossoms | - |
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| bibliomania | (noun) preoccupation with the acquisition and possession of books | - |
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| bicentennial | (noun) the 200th anniversary (or the celebration of it) | Synonyms: bicentenary |
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| biennial | (noun) (botany) a plant having a life cycle that normally takes two seasons from germination to death to complete; flowering biennials usually bloom and fruit in the second season | - |
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| bignoniad | (noun) any woody plant of the family Bignoniaceae | - |
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| bikini | (noun) a woman's very brief bathing suit | Synonyms: two-piece |
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| bimillennium | (noun) a span of 2000 years | Synonyms: bimillenary |
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| (noun) the 2000th anniversary (or the celebration of it) | Synonyms: bimillenary |
| bionics | (noun) application of biological principles to the study and design of engineering systems (especially electronic systems) | - |
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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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| biryani | (noun) an Indian dish made with highly seasoned rice and meat or fish or vegetables | Synonyms: biriani |
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| blackening | (noun) changing to a darker color | Synonyms: darkening |
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| blennioid | (noun) elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins | Synonyms: blennioid fish |
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| blini | (noun) Russian pancake of buckwheat flour and yeast; usually served with caviar and sour cream | Synonyms: bliny |
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| bocconia | (noun) small Central American tree having loose racemes of purple-tinted green flowers | Synonyms: Bocconia frutescens, tree celandine |
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| (noun) herb of China and Japan widely cultivated for its plumelike panicles of creamy white flowers | Synonyms: Macleaya cordata, plume poppy |
| bohemianism | (noun) conduct characteristic of a bohemian | - |
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| boniface | (noun) the owner or manager of an inn | Synonyms: host, innkeeper |
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| boniness | (noun) extreme leanness (usually caused by starvation or disease) | Synonyms: bonyness, emaciation, gauntness, maceration |
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| bonito | (noun) any of various scombroid fishes intermediate in size and characteristics between mackerels and tunas | - |
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| (noun) fish whose flesh is dried and flaked for Japanese cookery; may be same species as skipjack tuna | Synonyms: Katsuwonus pelamis, oceanic bonito |
| (noun) flesh of mostly Pacific food fishes of the genus Sarda of the family Scombridae; related to but smaller than tuna | - |
| bornite | (noun) a mineral consisting of sulfides of copper and iron that is found in copper deposits | Synonyms: peacock ore |
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| botanical | (noun) a drug made from part of a plant (as the bark or root or leaves) | - |
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| botanist | (noun) a biologist specializing in the study of plants | Synonyms: phytologist, plant scientist |
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| boutonniere | (noun) a flower that is worn in a buttonhole | - |
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| brainiac | (noun) someone who has exceptional intellectual ability and originality | Synonyms: brain, Einstein, genius, mastermind |
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| brawniness | (noun) possessing muscular strength | Synonyms: brawn, heftiness, muscle, muscularity, sinew |
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| brininess | (noun) the relative proportion of salt in a solution | Synonyms: salinity |
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| broadening | (noun) the action of making broader | - |
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| (noun) the act of making something wider | Synonyms: widening |
| (noun) an increase in width | Synonyms: widening |
| bronchopneumonia | (noun) pneumonia characterized by acute inflammation of the walls of the bronchioles | Synonyms: bronchial pneumonia |
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| brownie | (noun) square or bar of very rich chocolate cake usually with nuts | - |
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| (noun) (folklore) fairies that are somewhat mischievous | Synonyms: elf, gremlin, hob, imp, pixie, pixy |
| browning | (noun) cooking to a brown crispiness over a fire or on a grill | Synonyms: toasting |
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| bunion | (noun) a painful swelling of the bursa of the first joint of the big toe | - |
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| burning | (noun) the act of burning something | Synonyms: combustion |
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| (noun) execution by electricity | Synonyms: electrocution |
| (noun) execution by fire | Synonyms: burning at the stake |
| (noun) a form of torture in which cigarettes or cigars or other hot implements are used to burn the victim's skin | - |
| (noun) a process in which a substance reacts with oxygen to give heat and light | Synonyms: combustion |
| (noun) pain that feels hot as if it were on fire | Synonyms: burn |
| burnish | (noun) the property of being smooth and shiny | Synonyms: gloss, glossiness, polish |
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