| aardvark | (noun) nocturnal burrowing mammal of the grasslands of Africa that feeds on termites; sole extant representative of the order Tubulidentata | Synonyms: ant bear, anteater, Orycteropus afer |
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| abelmosk | (noun) bushy herb of tropical Asia grown for its yellow or pink to scarlet blooms that resemble the hibiscus | Synonyms: Abelmoschus moschatus, Hibiscus moschatus, musk mallow |
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| ackee | (noun) red pear-shaped tropical fruit with poisonous seeds; flesh is poisonous when unripe or overripe | Synonyms: akee |
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| acknowledgement | (noun) a statement acknowledging something or someone | Synonyms: acknowledgment |
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| (noun) the state or quality of being recognized or acknowledged | Synonyms: acknowledgment, recognition |
| acknowledgment | (noun) a statement acknowledging something or someone | Synonyms: acknowledgement |
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| (noun) a short note recognizing a source of information or of a quoted passage | Synonyms: citation, cite, credit, mention, quotation, reference |
| (noun) the state or quality of being recognized or acknowledged | Synonyms: acknowledgement, recognition |
| acromikria | (noun) abnormally small extremities (underdeveloped fingers and toes) | Synonyms: acromicria |
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| afterdeck | (noun) a deck abaft of midships | - |
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| aftershock | (noun) a tremor (or one of a series of tremors) occurring after the main shock of an earthquake | - |
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| aikido | (noun) a Japanese martial art employing principles similar to judo | - |
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| airbrake | (noun) a vehicular brake that operates by compressed air; especially for heavy vehicles | - |
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| (noun) a small parachute or articulated flap to reduce the speed of an aircraft | Synonyms: dive brake |
| airdock | (noun) a large structure at an airport where aircraft can be stored and maintained | Synonyms: hangar, repair shed |
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| airlock | (noun) a chamber that provides access to space where air is under pressure | Synonyms: air lock |
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| airsickness | (noun) motion sickness experienced while traveling by air (especially during turbulence) | Synonyms: air sickness |
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| akaryocyte | (noun) a cell without a nucleus (as an erythrocyte) | Synonyms: acaryote, akaryote |
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| akaryote | (noun) a cell without a nucleus (as an erythrocyte) | Synonyms: acaryote, akaryocyte |
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| akee | (noun) red pear-shaped tropical fruit with poisonous seeds; flesh is poisonous when unripe or overripe | Synonyms: ackee |
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| (noun) widely cultivated in tropical and subtropical regions for its fragrant flowers and colorful fruits; introduced in Jamaica by William Bligh | Synonyms: akee tree, Blighia sapida |
| akinesia | (noun) motionlessness attributable to a temporary paralysis | Synonyms: akinesis |
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| akinesis | (noun) motionlessness attributable to a temporary paralysis | Synonyms: akinesia |
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| akvavit | (noun) Scandinavian liquor usually flavored with caraway seeds | Synonyms: aquavit |
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| alikeness | (noun) similarity in appearance or character or nature between persons or things | Synonyms: likeness, similitude |
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| alkahest | (noun) hypothetical universal solvent once sought by alchemists | Synonyms: alcahest, universal solvent |
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| alkalemia | (noun) a blood disorder characterized by a lower concentration of hydrogen ions in the blood (which rises above 7.45 on the pH scale) | - |
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| alkali | (noun) any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water | Synonyms: base |
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| (noun) a mixture of soluble salts found in arid soils and some bodies of water; detrimental to agriculture | - |
| alkalimetry | (noun) volumetric analysis using standard solutions of alkali to measure the amount of acid present | - |
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| alkalinity | (noun) pH values above 7 | - |
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| alkalinuria | (noun) a condition in which the urine (which is normally slightly acidic) is alkaline | Synonyms: alkaluria |
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| alkaliser | (noun) an agent that counteracts or neutralizes acidity (especially in the stomach) | Synonyms: alkalizer, antacid, antiacid, gastric antacid |
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| alkalizer | (noun) an agent that counteracts or neutralizes acidity (especially in the stomach) | Synonyms: alkaliser, antacid, antiacid, gastric antacid |
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| alkaloid | (noun) natural bases containing nitrogen found in plants | - |
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| alkalosis | (noun) abnormally high alkalinity (low hydrogen-ion concentration) of the blood and other body tissues | - |
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| alkaluria | (noun) a condition in which the urine (which is normally slightly acidic) is alkaline | Synonyms: alkalinuria |
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| alkane | (noun) a series of non-aromatic saturated hydrocarbons with the general formula CnH(2n+2) | Synonyms: alkane series, methane series, paraffin, paraffin series |
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| alkanet | (noun) perennial or biennial herb cultivated for its delicate usually blue flowers | Synonyms: Anchusa officinalis, bugloss |
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| alkapton | (noun) an acid formed as an intermediate product of the metabolism of tyrosine and phenylalanine | Synonyms: alcapton, homogentisic acid |
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| alkaptonuria | (noun) a rare recessive metabolic anomaly marked by ochronosis and the presence of alkapton in the urine | Synonyms: alcaptonuria |
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| alkene | (noun) any unsaturated aliphatic hydrocarbon | Synonyms: olefin, olefine |
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| alky | (noun) a person who drinks alcohol to excess habitually | Synonyms: alcoholic, boozer, dipsomaniac, lush, soaker, souse |
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| alkyd | (noun) a durable synthetic resin widely used in adhesives and paints | Synonyms: alkyd resin |
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| alkyl | (noun) any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons | Synonyms: alkyl group, alkyl radical |
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| alkylbenzene | (noun) organic compound that has an alkyl group bound to a benzene ring | - |
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| alkylbenzenesulfonate | (noun) sulfonate of alkyl benzene | - |
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| alkyne | (noun) a colorless flammable gas used chiefly in welding and in organic synthesis | Synonyms: acetylene, ethyne |
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| alpenstock | (noun) a stout staff with a metal point; used by mountain climbers | - |
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| amberjack | (noun) any of several amber to coppery fork-tailed warm-water carangid fishes | Synonyms: amberfish |
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| aminoalkane | (noun) a compound derived from ammonia by replacing hydrogen atoms by univalent hydrocarbon radicals | Synonyms: amine |
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| aniseikonia | (noun) visual defect in which the shape and size of an ocular image differ in the two eyes | - |
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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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| ankus | (noun) an elephant goad with a sharp spike and a hook | - |
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| ankyloglossia | (noun) a congenital anomaly in which the mucous membrane under the tongue is too short limiting the mobility of the tongue | Synonyms: tongue tie |
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| ankylosaur | (noun) having the back covered with thick bony plates; thought to have walked with a sprawling gait resembling a lizard's | Synonyms: ankylosaurus |
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| ankylosaurus | (noun) having the back covered with thick bony plates; thought to have walked with a sprawling gait resembling a lizard's | Synonyms: ankylosaur |
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| ankylosis | (noun) abnormal adhesion and rigidity of the bones of a joint | Synonyms: anchylosis |
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| anorak | (noun) a kind of heavy jacket | Synonyms: parka, windbreaker, windcheater |
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| antiknock | (noun) any of various compounds that are added to gasoline to reduce engine knocking | - |
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| antiquark | (noun) the antiparticle of a quark | - |
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| aphakia | (noun) absence of the natural lens of the eye (usually resulting from the removal of cataracts) | - |
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| aphakic | (noun) someone afflicted by aphakia; someone lacking the natural lenses of the eyes | - |
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| apparatchik | (noun) a communist who was a member of the administrative system of a communist party | - |
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| (noun) a humorous but derogatory term for an official of a large organization (especially a political organization) | - |
| applejack | (noun) distilled from hard cider | - |
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| arak | (noun) any of various strong liquors distilled from the fermented sap of toddy palms or from fermented molasses | Synonyms: arrack |
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| archduke | (noun) a sovereign prince of the former ruling house of Austria | - |
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| ark | (noun) a boat built by Noah to save his family and animals from the flood | - |
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| arrack | (noun) any of various strong liquors distilled from the fermented sap of toddy palms or from fermented molasses | Synonyms: arak |
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| artichoke | (noun) a thistlelike flower head with edible fleshy leaves and heart | Synonyms: globe artichoke |
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| (noun) Mediterranean thistlelike plant widely cultivated for its large edible flower head | Synonyms: artichoke plant, Cynara scolymus, globe artichoke |
| artwork | (noun) photographs or other visual representations in a printed publication | Synonyms: art, graphics, nontextual matter |
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| ashcake | (noun) corn bread wrapped in cabbage leaves and baked in hot ashes (southern) | Synonyms: ash cake, corn tash |
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| asker | (noun) someone who asks a question | Synonyms: enquirer, inquirer, querier, questioner |
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| asking | (noun) the verbal act of requesting | Synonyms: request |
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| asterisk | (noun) a star-shaped character * used in printing | Synonyms: star |
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| astrakhan | (noun) the fur of young lambs | - |
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| attack | (noun) (military) an offensive against an enemy (using weapons) | Synonyms: onrush, onset, onslaught |
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| (noun) a decisive manner of beginning a musical tone or phrase | Synonyms: tone-beginning |
| (noun) the act of attacking | Synonyms: attempt |
| (noun) ideas or actions intended to deal with a problem or situation | Synonyms: approach, plan of attack |
| (noun) an offensive move in a sport or game | - |
| (noun) strong criticism | - |
| (noun) intense adverse criticism | Synonyms: blast, fire, flack, flak |
| (noun) the onset of a corrosive or destructive process (as by a chemical agent) | - |
| (noun) a sudden occurrence of an uncontrollable condition | - |
| attacker | (noun) someone who attacks | Synonyms: aggressor, assailant, assaulter |
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| auk | (noun) black-and-white short-necked web-footed diving bird of northern seas | - |
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| auklet | (noun) any of several small auks of the northern Pacific coasts | - |
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| autarky | (noun) economic independence as a national policy | Synonyms: autarchy |
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| automaker | (noun) a business engaged in the manufacture of automobiles | Synonyms: auto maker, auto manufacturer, car maker, car manufacturer, carmaker |
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| awakening | (noun) the act of waking | Synonyms: wakening, waking up |
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| awkwardness | (noun) the carriage of someone whose movements and posture are ungainly or inelegant | Synonyms: clumsiness |
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| (noun) the quality of an embarrassing situation | Synonyms: nuisance value |
| (noun) trouble in carrying or managing caused by bulk or shape | Synonyms: cumbersomeness, unwieldiness |
| (noun) the inelegance of someone stiff and unrelaxed (as by embarrassment) | Synonyms: clumsiness, gracelessness, stiffness |
| (noun) unskillfulness resulting from a lack of training | Synonyms: clumsiness, ineptitude, ineptness, maladroitness, slowness |
| babka | (noun) a coffee cake flavored with orange rind and raisins and almonds | - |
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| babushka | (noun) a woman's headscarf folded into a triangle and tied under the chin; worn by Russian peasant women | - |
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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 |
| back | (noun) (American football) the position of a player on a football team who is stationed behind the line of scrimmage | - |
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| (noun) the side that goes last or is not normally seen | Synonyms: rear |
| (noun) a support that you can lean against while sitting | Synonyms: backrest |
| (noun) the part of a garment that covers the back of your body | - |
| (noun) the protective covering on the front, back, and spine of a book | Synonyms: binding, book binding, cover |
| (noun) the posterior part of a human (or animal) body from the neck to the end of the spine | Synonyms: dorsum |
| (noun) the series of vertebrae forming the axis of the skeleton and protecting the spinal cord | Synonyms: backbone, rachis, spinal column, spine, vertebral column |
| (noun) the part of something that is furthest from the normal viewer | Synonyms: rear |
| (noun) (football) a person who plays in the backfield | - |
| backache | (noun) an ache localized in the back | - |
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| backband | (noun) a broad band that passes over the back of a horse and supports the shafts of a vehicle | - |
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| backbeat | (noun) a loud steady beat | - |
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| backbench | (noun) any of the seats occupied by backbenchers in the House of Commons | - |
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| backbencher | (noun) a member of the House of Commons who is not a party leader | - |
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| backbend | (noun) an acrobatic feat in which the trunk is bent backward from a standing position until the hands touch the floor | - |
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| backbiter | (noun) one who attacks the reputation of another by slander or libel | Synonyms: defamer, libeler, maligner, slanderer, traducer, vilifier |
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| backblast | (noun) backfire from a recoilless weapon | Synonyms: back-blast |
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| backboard | (noun) a board used to support the back of someone or something | - |
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| (noun) a raised vertical board with basket attached; used to play basketball | Synonyms: basketball backboard |
| backbone | (noun) the part of a network that connects other networks together | - |
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| (noun) the part of a book's cover that encloses the inner side of the book's pages and that faces outward when the book is shelved | Synonyms: spine |
| (noun) fortitude and determination | Synonyms: grit, gumption, guts, moxie, sand |
| (noun) the series of vertebrae forming the axis of the skeleton and protecting the spinal cord | Synonyms: back, rachis, spinal column, spine, vertebral column |
| (noun) a central cohesive source of support and stability | Synonyms: anchor, keystone, linchpin, lynchpin, mainstay |
| backchat | (noun) light teasing repartee | Synonyms: banter, give-and-take, raillery |
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| backcloth | (noun) scenery hung at back of stage | Synonyms: backdrop, background |
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| backdoor | (noun) a secret or underhand means of access (to a place or a position) | Synonyms: back door |
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| (noun) an entrance at the rear of a building | Synonyms: back door, back entrance |
| (noun) an undocumented way to get access to a computer system or the data it contains | Synonyms: back door |
| backdown | (noun) a retraction of a previously held position | Synonyms: climb-down, withdrawal |
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| backdrop | (noun) scenery hung at back of stage | Synonyms: backcloth, background |
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