| athetosis | (noun) a continuous succession of slow, writhing, involuntary movements of the hands and feet and other body parts | - |
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| atopognosia | (noun) absence or loss of topognosia; inability to locate correctly a point of touch | Synonyms: atopognosis |
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| atopognosis | (noun) absence or loss of topognosia; inability to locate correctly a point of touch | Synonyms: atopognosia |
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| atresia | (noun) an abnormal condition in which a normal opening or tube in the body (as the urethra) is closed or absent | - |
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| autocatalysis | (noun) catalysis in which the catalyst is one of the products of the reaction | - |
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| autogenesis | (noun) a hypothetical organic phenomenon by which living organisms are created from nonliving matter | Synonyms: abiogenesis, autogeny, spontaneous generation |
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| autolysis | (noun) lysis of plant or animal tissue by an internal process | Synonyms: self-digestion |
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| auxesis | (noun) growth from increase in cell size without cell division | - |
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| aversion | (noun) the act of turning yourself (or your gaze) away | Synonyms: averting |
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| (noun) a feeling of intense dislike | Synonyms: antipathy, distaste |
| avitaminosis | (noun) any of several diseases caused by deficiency of one or more vitamins | Synonyms: hypovitaminosis |
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| avulsion | (noun) a forcible tearing or surgical separation of one body part from another | - |
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| (noun) an abrupt change in the course of a stream that forms the boundary between two parcels of land resulting in the loss of part of the land of one landowner and a consequent increase in the land of another | - |
| babysitter | (noun) a person engaged to care for children when the parents are not home | Synonyms: baby-sitter, sitter |
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| babysitting | (noun) the work of a baby sitter; caring for children when their parents are not home | Synonyms: baby sitting |
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| backside | (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
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| (noun) the side of an object that is opposite its front | Synonyms: back end, rear |
| bacteriolysis | (noun) dissolution or destruction of bacteria | - |
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| bacteriostasis | (noun) inhibition of the growth of bacteria | - |
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| bagascosis | (noun) alveolitis caused by inhaling bagasse (sugarcane dust) | Synonyms: bagassosis |
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| bagassosis | (noun) alveolitis caused by inhaling bagasse (sugarcane dust) | Synonyms: bagascosis |
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| banksia | (noun) any shrub or tree of the genus Banksia having alternate leathery leaves apetalous yellow flowers often in showy heads and conelike fruit with winged seeds | - |
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| basic | (noun) (usually in the plural) a necessary commodity for which demand is constant | Synonyms: staple |
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| basics | (noun) principles from which other truths can be derived | Synonyms: basic principle, bedrock, fundamental principle, fundamentals |
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| (noun) a statement of fundamental facts or principles | Synonyms: rudiments |
| basidiocarp | (noun) the fruiting body of a basidiomycete which bears its spores on special cells | - |
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| basidiolichen | (noun) a lichen in which the fungus component is a basidiomycete | - |
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| basidiomycete | (noun) any of various fungi of the subdivision Basidiomycota | Synonyms: basidiomycetous fungi |
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| basidiospore | (noun) a sexually produced fungal spore borne on a basidium | - |
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| basidium | (noun) a small club-shaped structure typically bearing four basidiospores at the ends of minute projections; unique to basidiomycetes | - |
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| basil | (noun) leaves of the common basil; used fresh or dried | Synonyms: sweet basil |
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| (noun) any of several Old World tropical aromatic annual or perennial herbs of the genus Ocimum | - |
| basileus | (noun) a ruler of the eastern Roman Empire | - |
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| basilica | (noun) a Roman building used for public administration | Synonyms: Roman basilica |
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| (noun) an early Christian church designed like a Roman basilica; or a Roman Catholic church or cathedral accorded certain privileges | - |
| basilisk | (noun) small crested arboreal lizard able to run on its hind legs; of tropical America | - |
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| (noun) ancient brass cannon | - |
| (noun) (classical mythology) a serpent (or lizard or dragon) able to kill with its breath or glance | - |
| basin | (noun) a bowl-shaped vessel; usually used for holding food or liquids | - |
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| (noun) a bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face | Synonyms: lavatory, washbasin, washbowl, washstand |
| (noun) the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet | Synonyms: catchment area, catchment basin, drainage area, drainage basin, river basin, watershed |
| (noun) a natural depression in the surface of the land often with a lake at the bottom of it | - |
| (noun) the quantity that a basin will hold | Synonyms: basinful |
| basinet | (noun) a medieval steel helmet | - |
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| basinful | (noun) the quantity that a basin will hold | Synonyms: basin |
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| basis | (noun) the fundamental assumptions from which something is begun or developed or calculated or explained | Synonyms: base, cornerstone, foundation, fundament, groundwork |
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| (noun) a relation that provides the foundation for something | Synonyms: footing, ground |
| (noun) the most important or necessary part of something | Synonyms: base |
| bassine | (noun) coarse leaf fiber from palmyra palms used in making brushes and brooms | - |
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| bassinet | (noun) a basket (usually hooded) used as a baby's bed | - |
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| (noun) a perambulator that resembles a bassinet | - |
| bassist | (noun) a musician who play the bass viol | - |
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| 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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| battlesight | (noun) an arrangement of sights that makes possible the rapid aiming of a firearm at short ranges | Synonyms: battle sight |
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| bedside | (noun) space by the side of a bed (especially the bed of a sick or dying person) | - |
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| bedsit | (noun) a furnished sitting room with sleeping accommodations (and some plumbing) | Synonyms: bedsitter, bedsitting room |
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| bedsitter | (noun) a furnished sitting room with sleeping accommodations (and some plumbing) | Synonyms: bedsit, bedsitting room |
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| bellicosity | (noun) a natural disposition to fight | Synonyms: bellicoseness |
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| besieger | (noun) an enemy who lays siege to your position | - |
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| (noun) an energetic petitioner | - |
| besieging | (noun) the action of an armed force that surrounds a fortified place and isolates it while continuing to attack | Synonyms: beleaguering, military blockade, siege |
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| bilharziasis | (noun) an infestation with or a resulting infection caused by a parasite of the genus Schistosoma; common in the tropics and Far East; symptoms depend on the part of the body infected | Synonyms: bilharzia, schistosomiasis |
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| biodiversity | (noun) the diversity of plant and animal life in a particular habitat (or in the world as a whole) | - |
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| biogenesis | (noun) the production of living organisms from other living organisms | Synonyms: biogeny |
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| (noun) production of a chemical compound by a living organism | Synonyms: biosynthesis |
| biophysicist | (noun) a physicist who applies the methods of physics to biology | - |
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| biophysics | (noun) physics as applied to biological problems | - |
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| biosynthesis | (noun) production of a chemical compound by a living organism | Synonyms: biogenesis |
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| blastogenesis | (noun) theory that inherited characteristics are transmitted by germ plasm | - |
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| (noun) asexual reproduction by budding | - |
| blastomycosis | (noun) any of several infections of the skin or mucous membrane caused by Blastomyces | - |
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| blessing | (noun) the act of praying for divine protection | Synonyms: benediction |
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| (noun) the formal act of approving | Synonyms: approval, approving |
| (noun) a ceremonial prayer invoking divine protection | Synonyms: benediction |
| (noun) a short prayer of thanks before a meal | Synonyms: grace, thanksgiving |
| (noun) a desirable state | Synonyms: boon |
| bombsight | (noun) a sighting device in an aircraft for aiming bombs | - |
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| booboisie | (noun) class consisting of all those who are considered boobs | - |
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| borosilicate | (noun) a salt of boric and silicic acids | - |
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| bosie | (noun) a cricket ball bowled as if to break one way that actually breaks in the opposite way | Synonyms: bosie ball, googly, wrong 'un |
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| bossism | (noun) domination of a political organization by a party boss | - |
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| bourgeoisie | (noun) the social class between the lower and upper classes | Synonyms: middle class |
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| braising | (noun) cooking slowly in fat in a closed pot with little moisture | - |
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| brasier | (noun) large metal container in which coal or charcoal is burned; warms people who must stay outside for long times | Synonyms: brazier |
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| brassie | (noun) (formerly) a golfing wood with a face more elevated than a driver but less than a spoon | - |
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| brassiere | (noun) an undergarment worn by women to support their breasts | Synonyms: bandeau, bra |
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| broadside | (noun) the simultaneous firing of all the armament on one side of a warship | - |
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| (noun) the whole side of a vessel from stem to stern | - |
| (noun) all of the armament that is fired from one side of a warship | - |
| (noun) an advertisement (usually printed on a page or in a leaflet) intended for wide distribution | Synonyms: bill, broadsheet, circular, flier, flyer, handbill, throwaway |
| (noun) a speech of violent denunciation | Synonyms: philippic, tirade |
| bromeosin | (noun) a red fluorescent dye resulting from the action of bromine on fluorescein; used in cosmetics and as a biological stain for studying cell structures | Synonyms: eosin |
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| browsing | (noun) the act of feeding by continual nibbling | Synonyms: browse |
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| (noun) reading superficially or at random | Synonyms: browse |
| brucellosis | (noun) an infectious disease of domestic animals often resulting in spontaneous abortion; transmittable to human beings | Synonyms: Bang's disease, contagious abortion |
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| (noun) infectious bacterial disease of human beings transmitted by contact with infected animals or infected meat or milk products; characterized by fever and headache | Synonyms: Gibraltar fever, Malta fever, Mediterranean fever, Rock fever, undulant fever |
| burnside | (noun) facial hair that has grown down the side of a man's face in front of the ears (especially when the rest of the beard is shaved off) | Synonyms: mutton chop, side-whiskers, sideburn |
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| bursitis | (noun) inflammation of a bursa; frequently in the shoulder | - |
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| business | (noun) the principal activity in your life that you do to earn money | Synonyms: job, line, line of work, occupation |
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| (noun) the activity of providing goods and services involving financial and commercial and industrial aspects | Synonyms: business enterprise, commercial enterprise |
| (noun) the volume of commercial activity | - |
| (noun) incidental activity performed by an actor for dramatic effect | Synonyms: byplay, stage business |
| (noun) an immediate objective | - |
| (noun) a rightful concern or responsibility | - |
| (noun) a commercial or industrial enterprise and the people who constitute it | Synonyms: business concern, business organisation, business organization, concern |
| (noun) customers collectively | Synonyms: clientele, patronage |
| (noun) business concerns collectively | Synonyms: business sector |
| businessman | (noun) a person engaged in commercial or industrial business (especially an owner or executive) | Synonyms: man of affairs |
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| businessmen | (noun) the body of individuals who manage businesses | Synonyms: business community |
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| businesspeople | (noun) people who transact business (especially business executives) | Synonyms: business people |
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| businessperson | (noun) a capitalist who engages in industrial commercial enterprise | Synonyms: bourgeois |
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| businesswoman | (noun) a female businessperson | - |
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| buttressing | (noun) a support usually of stone or brick; supports the wall of a building | Synonyms: buttress |
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| cacogenesis | (noun) inability to produce hybrids that are both viable and fertile | - |
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| caenogenesis | (noun) introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (such as the addition of the placenta in mammalian evolution) | Synonyms: cainogenesis, cenogenesis, kainogenesis, kenogenesis |
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| caesium | (noun) a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal | Synonyms: atomic number 55, cesium, Cs |
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| cainogenesis | (noun) introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (such as the addition of the placenta in mammalian evolution) | Synonyms: caenogenesis, cenogenesis, kainogenesis, kenogenesis |
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| calliopsis | (noun) North American annual widely cultivated for its yellow flowers with purple-red to brownish centers; in some classifications placed in a subgenus Calliopsis | Synonyms: Coreopsis tinctoria |
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| callosity | (noun) devoid of passion or feeling; hardheartedness | Synonyms: callousness, hardness, insensibility, unfeelingness |
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| (noun) an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot) | Synonyms: callus |
| campsite | (noun) a site where people on holiday can pitch a tent | Synonyms: bivouac, campground, camping area, camping ground, camping site, encampment |
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| candidiasis | (noun) an infection caused by fungi of the genus Monilia or Candida (especially Candida albicans) | Synonyms: monilia disease, moniliasis |
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| canvassing | (noun) persuasion of voters in a political campaign | Synonyms: bell ringing, electioneering |
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| canyonside | (noun) the steeply sloping side of a canyon | - |
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| capsicum | (noun) any of various tropical plants of the genus Capsicum bearing peppers | Synonyms: capsicum pepper plant, pepper |
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| capsid | (noun) the outer covering of protein surrounding the nucleic acid of a virus | - |
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| (noun) a variety of leaf bug | Synonyms: mirid, mirid bug |
| capsizing | (noun) (nautical) the event of a boat accidentally turning over in the water | - |
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| caressing | (noun) affectionate play (or foreplay without contact with the genital organs) | Synonyms: cuddling, fondling, hugging, kissing, necking, petting, smooching, snuggling |
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| caryopsis | (noun) dry seed-like fruit produced by the cereal grasses: e.g. wheat, barley, Indian corn | Synonyms: grain |
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| casing | (noun) the enclosing frame around a door or window opening | Synonyms: case |
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| (noun) the housing or outer covering of something | Synonyms: case, shell |
| (noun) the outermost covering of a pneumatic tire | - |
| casino | (noun) a card game in which cards face up on the table are taken with eligible cards in the hand | Synonyms: cassino |
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| (noun) a public building for gambling and entertainment | Synonyms: gambling casino |
| cassia | (noun) any of various trees or shrubs of the genus Cassia having pinnately compound leaves and usually yellow flowers followed by long seedpods | - |
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| (noun) Chinese tree with aromatic bark; yields a less desirable cinnamon than Ceylon cinnamon | Synonyms: cassia-bark tree, Cinnamomum cassia |
| cassie | (noun) tropical American thorny shrub or small tree; fragrant yellow flowers used in making perfumery | Synonyms: Acacia farnesiana, flame tree, huisache, mimosa bush, scented wattle, sweet acacia, sweet wattle |
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| cassino | (noun) a card game in which cards face up on the table are taken with eligible cards in the hand | Synonyms: casino |
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| cassiri | (noun) a drink resembling beer; made from fermented cassava juice | - |
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| cassiterite | (noun) a hard heavy dark mineral that is the chief source of tin | - |
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