| animalcule | (noun) microscopic organism such as an amoeba or paramecium | Synonyms: animalculum |
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| ankle | (noun) a gliding joint between the distal ends of the tibia and fibula and the proximal end of the talus | Synonyms: ankle joint, articulatio talocruralis, mortise joint |
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| anklebone | (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: astragal, astragalus, talus |
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| anklet | (noun) an ornament worn around the ankle | Synonyms: ankle bracelet |
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| (noun) a sock that reaches just above the ankle | Synonyms: anklets, bobbysock, bobbysocks |
| (noun) a shoe for a child or woman that has a strap around the ankle | - |
| anklets | (noun) a sock that reaches just above the ankle | Synonyms: anklet, bobbysock, bobbysocks |
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| annulet | (noun) molding in the form of a ring; at top of a column | Synonyms: bandelet, bandelette, bandlet, square and rabbet |
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| (noun) (heraldry) a charge in the shape of a small ring | - |
| anole | (noun) small arboreal tropical American insectivorous lizards with the ability to change skin color | Synonyms: American chameleon, Anolis carolinensis |
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| answerableness | (noun) responsibility to someone or for some activity | Synonyms: accountability, answerability |
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| antielectron | (noun) an elementary particle with positive charge; interaction of a positron and an electron results in annihilation | Synonyms: positron |
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| antiepileptic | (noun) a drug used to treat or prevent convulsions (as in epilepsy) | Synonyms: anticonvulsant, anticonvulsant drug, antiepileptic drug |
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| antiflatulent | (noun) any agent that reduces intestinal gas | - |
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| antilepton | (noun) the antiparticle of a lepton | - |
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| antiparticle | (noun) a particle that has the same mass as another particle but has opposite values for its other properties; interaction of a particle and its antiparticle results in annihilation and the production of radiant energy | - |
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| antler | (noun) deciduous horn of a member of the deer family | - |
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| apolemia | (noun) large siphonophore of up to 50 ft long | - |
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| apoplexy | (noun) a sudden loss of consciousness resulting when the rupture or occlusion of a blood vessel leads to oxygen lack in the brain | Synonyms: cerebrovascular accident, CVA, stroke |
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| aposelene | (noun) apoapsis in orbit around the moon | Synonyms: apolune |
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| apostle | (noun) an ardent early supporter of a cause or reform | - |
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| apostleship | (noun) the position of apostle | - |
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| appendicle | (noun) a small appendage | - |
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| apple | (noun) fruit with red or yellow or green skin and sweet to tart crisp whitish flesh | - |
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| (noun) native Eurasian tree widely cultivated in many varieties for its firm rounded edible fruits | Synonyms: Malus pumila, orchard apple tree |
| applecart | (noun) a handcart from which apples and other fruit are sold in the street | - |
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| (noun) the planning that is disrupted when someone `upsets the applecart' | - |
| applejack | (noun) distilled from hard cider | - |
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| applemint | (noun) mint with apple-scented stems of southern and western Europe; naturalized in United States | Synonyms: apple mint, Mentha rotundifolia, Mentha suaveolens |
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| applesauce | (noun) nonsensical talk or writing | Synonyms: codswallop, folderol, rubbish, trash, tripe, trumpery, wish-wash |
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| (noun) puree of stewed apples usually sweetened and spiced | Synonyms: apple sauce |
| applet | (noun) a Java application; an application program that uses the client's web browser to provide a user interface | - |
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| applewood | (noun) wood of any of various apple trees of the genus Malus | - |
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| aquilege | (noun) a plant of the genus Aquilegia having irregular showy spurred flowers; north temperate regions especially mountains | Synonyms: aquilegia, columbine |
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| aquilegia | (noun) a plant of the genus Aquilegia having irregular showy spurred flowers; north temperate regions especially mountains | Synonyms: aquilege, columbine |
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| arbalest | (noun) late version of the crossbow with a steel bow | Synonyms: arbalist |
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| areflexia | (noun) absence of a reflex; a sign of possible nerve damage | - |
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| argyle | (noun) a sock knitted or woven with an argyle design | Synonyms: argyll |
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| (noun) a design consisting of a pattern of varicolored diamonds on a solid background (originally for knitted articles); patterned after the tartan of a clan in western Scotland | Synonyms: argyll |
| (noun) a covered gravy holder of silver or other metal containing a detachable central vessel for hot water to keep the gravy warm | Synonyms: argyll |
| arles | (noun) money given by a buyer to a seller to bind a contract | Synonyms: earnest money |
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| armhole | (noun) a hole through which you put your arm and where a sleeve can be attached | - |
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| armlet | (noun) a band worn around the arm for decoration | Synonyms: arm band |
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| arsehole | (noun) vulgar slang for anus | Synonyms: arse, asshole, bunghole |
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| arteriole | (noun) one of the small thin-walled arteries that end in capillaries | Synonyms: arteriola, capillary artery |
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| arteriolosclerosis | (noun) sclerosis of the arterioles | - |
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| arteriosclerosis | (noun) sclerosis of the arterial walls | Synonyms: arterial sclerosis, coronary-artery disease, hardening of the arteries, induration of the arteries |
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| article | (noun) one of a class of artifacts | - |
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| (noun) nonfictional prose forming an independent part of a publication | - |
| (noun) (grammar) a determiner that may indicate the specificity of reference of a noun phrase | - |
| (noun) a separate section of a legal document (as a statute or contract or will) | Synonyms: clause |
| artillery | (noun) large but transportable armament | Synonyms: gun, heavy weapon, ordnance |
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| (noun) a means of persuading or arguing | Synonyms: weapon |
| (noun) an army unit that uses big guns | Synonyms: artillery unit |
| artilleryman | (noun) a serviceman in the artillery | Synonyms: cannoneer, gunner, machine gunner |
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| artlessness | (noun) ingenuousness by virtue of being free from artful deceit | - |
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| (noun) the quality of innocent naivete | Synonyms: ingenuousness, innocence, naturalness |
| asclepiad | (noun) any plant of the family Asclepiadaceae | - |
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| assembler | (noun) a program to convert assembly language into machine language | Synonyms: assembly program |
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| asshole | (noun) vulgar slang for anus | Synonyms: arse, arsehole, bunghole |
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| (noun) insulting terms of address for people who are stupid or irritating or ridiculous | Synonyms: bastard, cocksucker, dickhead, mother fucker, motherfucker, prick, shit, SOB, son of a bitch, whoreson |
| associableness | (noun) the capability of being easily associated or joined or connected in thought | Synonyms: associability |
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| asystole | (noun) absence of systole; failure of the ventricles of the heart to contract (usually caused by ventricular fibrillation) with consequent absence of the heart beat leading to oxygen lack and eventually to death | Synonyms: cardiac arrest, cardiopulmonary arrest |
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| atelectasis | (noun) collapse of an expanded lung (especially in infants); also failure of pulmonary alveoli to expand at birth | - |
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| ateleiosis | (noun) a form of infantilism characterized by physical underdevelopment but normal intelligence | Synonyms: ateliosis |
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| atherosclerosis | (noun) a stage of arteriosclerosis involving fatty deposits (atheromas) inside the arterial walls, thus narrowing the arteries | Synonyms: coronary artery disease |
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| athlete | (noun) a person trained to compete in sports | Synonyms: jock |
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| athleticism | (noun) intense energy | Synonyms: strenuosity |
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| athletics | (noun) an active diversion requiring physical exertion and competition | Synonyms: sport |
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| (noun) participation in sports events as an extracurricular activity | - |
| (noun) a contest between athletes | Synonyms: athletic competition, athletic contest |
| atole | (noun) eaten as mush or as a thin gruel | - |
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| attainableness | (noun) the state of being achievable | Synonyms: achievability, attainability |
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| audible | (noun) a football play is changed orally after both teams have assumed their positions at the line of scrimmage | - |
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| audibleness | (noun) quality or fact or degree of being audible or perceptible by the ear | Synonyms: audibility |
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| audile | (noun) one whose mental imagery is auditory rather than visual or motor | - |
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| auklet | (noun) any of several small auks of the northern Pacific coasts | - |
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| aureole | (noun) an indication of radiant light drawn around the head of a saint | Synonyms: aura, gloriole, glory, halo, nimbus |
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| (noun) the outermost region of the sun's atmosphere; visible as a white halo during a solar eclipse | Synonyms: corona |
| auricle | (noun) a small conical pouch projecting from the upper anterior part of each atrium of the heart | Synonyms: atrial auricle, auricula atrii |
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| (noun) the externally visible cartilaginous structure of the external ear | Synonyms: ear, pinna |
| automobile | (noun) a motor vehicle with four wheels; usually propelled by an internal combustion engine | Synonyms: auto, car, machine, motorcar |
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| availableness | (noun) the quality of being at hand when needed | Synonyms: accessibility, availability, handiness |
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| axle | (noun) a shaft on which a wheel rotates | - |
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| axletree | (noun) a dead axle on a carriage or wagon that has terminal spindles on which the wheels revolve | - |
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| axolemma | (noun) outer membrane covering an axon | - |
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| azalea | (noun) any of numerous ornamental shrubs grown for their showy flowers of various colors | - |
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| babble | (noun) gibberish resembling the sounds of a baby | Synonyms: babbling, lallation |
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| babbler | (noun) any of various insectivorous Old World birds with a loud incessant song; in some classifications considered members of the family Muscicapidae | Synonyms: cackler |
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| (noun) an obnoxious and foolish and loquacious talker | Synonyms: chatterbox, chatterer, magpie, prater, spouter |
| baddeleyite | (noun) a mineral consisting of zirconium oxide | - |
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| baffle | (noun) a flat plate that controls or directs the flow of fluid or energy | Synonyms: baffle board |
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| baffled | (noun) people who are frustrated and perplexed | - |
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| bafflement | (noun) confusion resulting from failure to understand | Synonyms: befuddlement, bemusement, bewilderment, mystification, obfuscation, puzzlement |
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| bagatelle | (noun) a table game in which short cues are used to knock balls into holes that are guarded by wooden pegs; penalties are incurred if the pegs are knocked over | Synonyms: bar billiards |
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| (noun) something of little value or significance | Synonyms: fluff, frippery, frivolity |
| (noun) a light piece of music for piano | - |
| bailee | (noun) the agent to whom property involved in a bailment is delivered | - |
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| bailey | (noun) the outer defensive wall that surrounds the outer courtyard of a castle | - |
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| (noun) the outer courtyard of a castle | - |
| bakeapple | (noun) creeping raspberry of north temperate regions with yellow or orange berries | Synonyms: baked-apple berry, cloudberry, dwarf mulberry, Rubus chamaemorus, salmonberry |
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| bale | (noun) a large bundle bound for storage or transport | - |
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| baleen | (noun) a horny material from the upper jaws of certain whales; used as the ribs of fans or as stays in corsets | Synonyms: whalebone |
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| balefire | (noun) a large outdoor fire that is lighted as a signal or in celebration | Synonyms: bonfire |
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| balefulness | (noun) the quality or nature of being harmful or evil | Synonyms: maleficence, mischief |
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| ballerina | (noun) a female ballet dancer | Synonyms: danseuse |
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| ballet | (noun) a theatrical representation of a story that is performed to music by trained dancers | Synonyms: concert dance |
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| (noun) music written for a ballet | - |
| balletomane | (noun) a ballet enthusiast | - |
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| balletomania | (noun) extraordinary enthusiasm for ballets | - |
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| bandelet | (noun) molding in the form of a ring; at top of a column | Synonyms: annulet, bandelette, bandlet, square and rabbet |
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| bandelette | (noun) molding in the form of a ring; at top of a column | Synonyms: annulet, bandelet, bandlet, square and rabbet |
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| banderillero | (noun) the bullfighter who implants decorated darts (banderillas) into the neck or shoulders of the bull during a bull fight | - |
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| bandleader | (noun) the leader of a dance band | - |
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| bandlet | (noun) molding in the form of a ring; at top of a column | Synonyms: annulet, bandelet, bandelette, square and rabbet |
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| bandoleer | (noun) a broad cartridge belt worn over the shoulder by soldiers | Synonyms: bandolier |
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| bandyleg | (noun) a leg bowed outward at the knee (or below the knee) | Synonyms: bandy leg, bow leg, bowleg, genu varum, tibia vara |
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| bangle | (noun) cheap showy jewelry or ornament on clothing | Synonyms: bauble, fallal, gaud, gewgaw, novelty, trinket |
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| (noun) jewelry worn around the wrist for decoration | Synonyms: bracelet |
| barcarole | (noun) a boating song sung by Venetian gondoliers | Synonyms: barcarolle |
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| barcarolle | (noun) a boating song sung by Venetian gondoliers | Synonyms: barcarole |
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| barley | (noun) a grain of barley | Synonyms: barleycorn |
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| (noun) cultivated since prehistoric times; grown for forage and grain | - |
| barleycorn | (noun) a grain of barley | Synonyms: barley |
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| (noun) a grain of barley | - |
| barnacle | (noun) marine crustaceans with feathery food-catching appendages; free-swimming as larvae; as adults form a hard shell and live attached to submerged surfaces | Synonyms: cirriped, cirripede |
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| (noun) European goose smaller than the brant; breeds in the far north | Synonyms: barnacle goose, Branta leucopsis |
| bartlett | (noun) juicy yellow pear | Synonyms: bartlett pear |
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