| acarophobia | (noun) a morbid fear of small insects and mites and worms | - |
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| acousticophobia | (noun) a morbid fear of sounds including your own voice | Synonyms: phonophobia |
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| acrobat | (noun) an athlete who performs acts requiring skill and agility and coordination | - |
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| acrobatics | (noun) the gymnastic moves of an acrobat | Synonyms: tumbling |
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| (noun) the performance of stunts while in flight in an aircraft | Synonyms: aerobatics, stunt flying, stunting |
| acrophobia | (noun) a morbid fear of great heights | - |
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| adobe | (noun) sun-dried brick; used in hot dry climates | Synonyms: adobe brick |
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| (noun) the clay from which adobe bricks are made | - |
| adobo | (noun) a dish of marinated vegetables and meat or fish; served with rice | - |
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| aerobatics | (noun) the performance of stunts while in flight in an aircraft | Synonyms: acrobatics, stunt flying, stunting |
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| aerobe | (noun) an organism (especially a bacterium) that requires air or free oxygen for life | - |
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| aerobics | (noun) exercise that increases the need for oxygen | Synonyms: aerobic exercise |
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| aerobiosis | (noun) life sustained in the presence of air or oxygen | - |
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| agammaglobulinemia | (noun) a rare immunological disorder characterized by the virtual absence of gamma globulin in the blood and consequent susceptibility to infection | - |
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| agoraphobia | (noun) a morbid fear of open spaces (as fear of being caught alone in some public place) | - |
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| agrobiology | (noun) the study of plant nutrition and growth especially as a way to increase crop yield | - |
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| ailurophobia | (noun) a morbid fear of cats | - |
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| algarobilla | (noun) mesquite pod used in tanning and dyeing | Synonyms: algarroba, algarrobilla |
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| algarroba | (noun) evergreen Mediterranean tree with edible pods; the biblical carob | Synonyms: carob, carob bean tree, carob tree, Ceratonia siliqua |
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| (noun) mesquite of Gulf Coast and Caribbean Islands from Mexico to Venezuela | Synonyms: Prosopis juliflora, Prosopis juliiflora |
| (noun) long pod containing small beans and sweetish edible pulp; used as animal feed and source of a chocolate substitute | Synonyms: algarroba bean, carob, carob bean, locust bean, locust pod |
| (noun) mesquite pod used in tanning and dyeing | Synonyms: algarobilla, algarrobilla |
| algarrobilla | (noun) mesquite pod used in tanning and dyeing | Synonyms: algarobilla, algarroba |
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| algophobia | (noun) a morbid fear of pain | - |
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| ameloblast | (noun) a cell from which tooth enamel develops | - |
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| aminobenzine | (noun) oily poisonous liquid amine obtained from nitrobenzene and used to make dyes and plastics and medicines | Synonyms: aniline, aniline oil, phenylamine |
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| ammobium | (noun) any plant of the genus Ammobium having yellow flowers and silvery foliage | - |
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| amobarbital | (noun) a barbiturate with sedative and hypnotic effects; used to relieve insomnia and as an anticonvulsant | - |
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| anaerobe | (noun) an organism (especially a bacterium) that does not require air or free oxygen to live | - |
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| androphobia | (noun) a morbid fear of men | - |
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| anglophobe | (noun) a person who hates England and everything English | - |
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| antimicrobial | (noun) an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease | Synonyms: antimicrobic, disinfectant, germicide |
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| antimicrobic | (noun) an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease | Synonyms: antimicrobial, disinfectant, germicide |
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| approbation | (noun) official recognition or approval | - |
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| (noun) official approval | - |
| aquaphobia | (noun) a morbid fear of drowning | - |
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| arachnophobia | (noun) a morbid fear of spiders | - |
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| araroba | (noun) a bitter yellow powder used to treat skin diseases | Synonyms: chrysarobin, Goa powder |
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| archaeobacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaebacterium, archeobacteria |
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| archeobacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaebacterium, archaeobacteria |
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| arroba | (noun) a unit of weight used in some Spanish speaking countries | - |
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| (noun) a liquid measure (with different values) used in some Spanish speaking countries | - |
| astraphobia | (noun) a morbid fear of thunder and lightning | - |
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| astrobiology | (noun) the branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life | Synonyms: exobiology, space biology |
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| autobahn | (noun) an expressway in a German-speaking country | - |
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| autobiographer | (noun) someone who writes their own biography | - |
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| autobiography | (noun) a biography of yourself | - |
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| autobus | (noun) a vehicle carrying many passengers; used for public transport | Synonyms: bus, charabanc, coach, double-decker, jitney, motorbus, motorcoach, omnibus, passenger vehicle |
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| automobile | (noun) a motor vehicle with four wheels; usually propelled by an internal combustion engine | Synonyms: auto, car, machine, motorcar |
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| automobilist | (noun) someone who drives (or travels in) an automobile | Synonyms: motorist |
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| automysophobia | (noun) a morbid fear of being dirty | - |
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| baobab | (noun) African tree having an exceedingly thick trunk and fruit that resembles a gourd and has an edible pulp called monkey bread | Synonyms: Adansonia digitata, monkey-bread tree |
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| bathrobe | (noun) a loose-fitting robe of towelling; worn after a bath or swim | - |
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| blob | (noun) an indistinct shapeless form | - |
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| bloodmobile | (noun) a motor vehicle equipped to collect blood donations | - |
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| blowjob | (noun) slang for fellatio | Synonyms: cock sucking |
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| bob | (noun) a short abrupt inclination (as of the head) | - |
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| (noun) a short or shortened tail of certain animals | Synonyms: bobtail, dock |
| (noun) a small float usually made of cork; attached to a fishing line | Synonyms: bobber, bobfloat, cork |
| (noun) a hanging weight, especially a metal ball on a string | - |
| (noun) a long racing sled (for 2 or more people) with a steering mechanism | Synonyms: bobsled, bobsleigh |
| (noun) a hair style for women and children; a short haircut all around | - |
| (noun) a former monetary unit in Great Britain | Synonyms: British shilling, shilling |
| bobber | (noun) a small float usually made of cork; attached to a fishing line | Synonyms: bob, bobfloat, cork |
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| bobbin | (noun) a winder around which thread or tape or film or other flexible materials can be wound | Synonyms: reel, spool |
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| bobble | (noun) the momentary juggling of a batted or thrown baseball | - |
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| bobby | (noun) an informal term for a British policeman | - |
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| bobbysock | (noun) a sock that reaches just above the ankle | Synonyms: anklet, anklets, bobbysocks |
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| bobbysocks | (noun) a sock that reaches just above the ankle | Synonyms: anklet, anklets, bobbysock |
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| bobbysoxer | (noun) an adolescent girl wearing bobby socks (common in the 1940s) | Synonyms: bobby-socker |
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| bobcat | (noun) small lynx of North America | Synonyms: bay lynx, Lynx rufus |
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| bobfloat | (noun) a small float usually made of cork; attached to a fishing line | Synonyms: bob, bobber, cork |
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| bobolink | (noun) migratory American songbird | Synonyms: Dolichonyx oryzivorus, reedbird, ricebird |
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| bobsled | (noun) a long racing sled (for 2 or more people) with a steering mechanism | Synonyms: bob, bobsleigh |
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| (noun) formerly two short sleds coupled together | Synonyms: bobsleigh |
| bobsledding | (noun) riding on a bobsled | - |
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| bobsleigh | (noun) a long racing sled (for 2 or more people) with a steering mechanism | Synonyms: bob, bobsled |
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| (noun) formerly two short sleds coupled together | Synonyms: bobsled |
| bobtail | (noun) a short or shortened tail of certain animals | Synonyms: bob, dock |
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| (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 |
| bobwhite | (noun) a popular North American game bird; named for its call | Synonyms: bobwhite quail, partridge |
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| bonobo | (noun) small chimpanzee of swamp forests in Zaire; a threatened species | Synonyms: Pan paniscus, pygmy chimpanzee |
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| boob | (noun) either of two soft fleshy milk-secreting glandular organs on the chest of a woman | Synonyms: bosom, breast, knocker, tit, titty |
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| (noun) an ignorant or foolish person | Synonyms: booby, dope, dumbbell, dummy, pinhead |
| booboisie | (noun) class consisting of all those who are considered boobs | - |
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| booby | (noun) small tropical gannet having a bright bill or bright feet or both | - |
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| (noun) an ignorant or foolish person | Synonyms: boob, dope, dumbbell, dummy, pinhead |
| bookmobile | (noun) a van with shelves of books; serves as a mobile library or bookstore | - |
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| broncobuster | (noun) a person who breaks horses | Synonyms: bronco buster, buster |
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| carob | (noun) powder from the ground seeds and pods of the carob tree; used as a chocolate substitute | Synonyms: carob powder, Saint-John's-bread |
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| (noun) evergreen Mediterranean tree with edible pods; the biblical carob | Synonyms: algarroba, carob bean tree, carob tree, Ceratonia siliqua |
| (noun) long pod containing small beans and sweetish edible pulp; used as animal feed and source of a chocolate substitute | Synonyms: algarroba, algarroba bean, carob bean, locust bean, locust pod |
| cenobite | (noun) a member of a religious order living in common | Synonyms: coenobite |
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| chlorobenzene | (noun) a colorless volatile flammable liquid with an almond odor that is made from chlorine and benzene; used as a solvent and in the production of phenol and DDT and other organic compounds | - |
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| chlorobenzylidenemalononitrile | (noun) a tear gas that is stronger than CN gas but wears off faster; can be deployed by grenades or cluster bombs; can cause skin burns and fatal pulmonary edema | Synonyms: CS gas |
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| chromoblastomycosis | (noun) a fungal infection characterized by itchy warty nodules on the skin | - |
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| chrysarobin | (noun) a bitter yellow powder used to treat skin diseases | Synonyms: araroba, Goa powder |
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| chrysoberyl | (noun) a rare hard yellow green mineral consisting of beryllium aluminate in crystal form; used as a gemstone | - |
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| claustrophobe | (noun) a person suffering from claustrophobia | - |
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| claustrophobia | (noun) a morbid fear of being closed in a confined space | - |
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| clobber | (noun) informal terms for personal possessions | Synonyms: stuff |
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| cob | (noun) adult male swan | - |
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| (noun) stocky short-legged harness horse | - |
| (noun) white gull having a black back and wings | Synonyms: black-backed gull, great black-backed gull, Larus marinus |
| (noun) nut of any of several trees of the genus Corylus | Synonyms: cobnut, filbert, hazelnut |
| cobalamin | (noun) a B vitamin that is used to treat pernicious anemia | Synonyms: antipernicious anemia factor, cyanocobalamin, vitamin B12 |
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| cobalt | (noun) a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition | Synonyms: atomic number 27, Co |
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| cobaltite | (noun) a rare silvery-white mineral; important ore of cobalt | - |
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| cobber | (noun) Australian term for a pal | - |
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| cobble | (noun) rectangular paving stone with curved top; once used to make roads | Synonyms: cobblestone, sett |
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| cobbler | (noun) a pie made of fruit with rich biscuit dough usually only on top of the fruit | Synonyms: deep-dish pie |
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| (noun) tall sweetened iced drink of wine or liquor with fruit | - |
| (noun) a person who makes or repairs shoes | Synonyms: shoemaker |
| cobblers | (noun) a man's testicles | - |
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| (noun) nonsense | - |
| cobblestone | (noun) rectangular paving stone with curved top; once used to make roads | Synonyms: cobble, sett |
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| cobbling | (noun) the shoemaker's trade | Synonyms: shoe repairing, shoemaking |
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| cobia | (noun) large dark-striped tropical food and game fish related to remoras; found worldwide in coastal to open waters | Synonyms: Rachycentron canadum, sergeant fish |
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| cobnut | (noun) nut of any of several trees of the genus Corylus | Synonyms: cob, filbert, hazelnut |
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| (noun) small nut-bearing tree much grown in Europe | Synonyms: Corylus avellana, Corylus avellana grandis, filbert |
| cobra | (noun) venomous Asiatic and African elapid snakes that can expand the skin of the neck into a hood | - |
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| cobweb | (noun) a dense elaborate spider web that is more efficient than the orb web | - |
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| (noun) filaments from a web that was spun by a spider | Synonyms: gossamer |
| (noun) a fabric so delicate and transparent as to resemble a web of a spider | - |
| coccobacillus | (noun) a bacterial cell intermediate in morphology between a coccus and a bacillus; a very short bacillus | - |
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| cocobolo | (noun) a valuable timber tree of tropical South America | Synonyms: Dalbergia retusa |
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| coenobite | (noun) a member of a religious order living in common | Synonyms: cenobite |
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| collywobbles | (noun) severe gastroenteritis of unknown etiology; characterized by severe colic and vomiting and diarrhea | Synonyms: cholera morbus |
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| colobus | (noun) arboreal monkey of western and central Africa with long silky fur and reduced thumbs | Synonyms: colobus monkey |
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