| 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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| aback | (adverb) by surprise | - |
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| (adverb) having the wind against the forward side of the sails | - |
| 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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| acknowledge | (verb) accept as legally binding and valid | - |
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| (verb) accept (someone) to be what is claimed or accept his power and authority | Synonyms: know, recognise, recognize |
| (verb) declare to be true or admit the existence or reality or truth of | Synonyms: admit |
| (verb) express obligation, thanks, or gratitude for | Synonyms: recognise, recognize |
| (verb) report the receipt of | Synonyms: receipt |
| (verb) express recognition of the presence or existence of, or acquaintance with | Synonyms: notice |
| acknowledgeable | (adjective) capable of being acknowledged | - |
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| acknowledged | (adjective) recognized or made known or admitted | - |
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| (adjective) generally accepted | - |
| 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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| aflicker | (adjective) shining unsteadily | Synonyms: flickering |
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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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| ahorseback | (adjective) traveling on horseback | Synonyms: ahorse |
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| (adverb) on the back of a horse | Synonyms: ahorse, horseback |
| 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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| airlike | (adjective) resembling air or having the form of air | Synonyms: aeriform |
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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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| airsick | (adjective) experiencing motion sickness | Synonyms: air sick, carsick, seasick |
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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 |
| akimbo | (adjective) (used of arms and legs) bent outward with the joint away from the body | - |
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| (adverb) with hands on hips and elbows extending outward | - |
| akin | (adjective) related by blood | Synonyms: blood-related, cognate, consanguine, consanguineal, consanguineous, kin |
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| (adjective) similar in quality or character | Synonyms: kindred |
| 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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| alike | (adjective) having the same or similar characteristics | Synonyms: like, similar |
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| (adverb) equally | Synonyms: likewise |
| (adverb) in a like manner | - |
| 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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| alkahestic | (adjective) of or pertaining to the alkahest that alchemists assumed to exist | - |
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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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| alkalescent | (adjective) tending to become alkaline; slightly alkaline | Synonyms: alcalescent |
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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 | - |
| alkalic | (adjective) relating to or containing an alkali; having a pH greater than 7 | Synonyms: alkaline |
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| alkalify | (verb) turn basic and less acidic | Synonyms: alkalise, alkalize, basify |
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| alkalimetry | (noun) volumetric analysis using standard solutions of alkali to measure the amount of acid present | - |
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| alkaline | (adjective) relating to or containing an alkali; having a pH greater than 7 | Synonyms: alkalic |
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| alkalinise | (verb) make (a substance) alkaline | Synonyms: alkalinize |
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| (verb) become alkaline | Synonyms: alkalinize |
| alkalinity | (noun) pH values above 7 | - |
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| alkalinize | (verb) make (a substance) alkaline | Synonyms: alkalinise |
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| (verb) become alkaline | Synonyms: alkalinise |
| alkalinuria | (noun) a condition in which the urine (which is normally slightly acidic) is alkaline | Synonyms: alkaluria |
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| alkalise | (verb) turn basic and less acidic | Synonyms: alkalify, alkalize, basify |
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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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| alkalize | (verb) turn basic and less acidic | Synonyms: alkalify, alkalise, basify |
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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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| alkaloidal | (adjective) pertaining to or consisting of alkaloids | - |
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| alkalosis | (noun) abnormally high alkalinity (low hydrogen-ion concentration) of the blood and other body tissues | - |
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| alkalotic | (adjective) marked by alkalosis (or a tendency toward alkalosis) | - |
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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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| alkylic | (adjective) of or related to an alkyl | - |
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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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| amok | (adjective) wildly frenzied and out of control | Synonyms: amuck, berserk |
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| (adverb) in a murderous frenzy | Synonyms: amuck, murderously |
| (adverb) wildly; without self-control | Synonyms: amuck |
| amuck | (adjective) wildly frenzied and out of control | Synonyms: amok, berserk |
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| (adverb) in a murderous frenzy | Synonyms: amok, murderously |
| (adverb) wildly; without self-control | Synonyms: amok |
| aniseikonia | (noun) visual defect in which the shape and size of an ocular image differ in the two eyes | - |
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| aniseikonic | (adjective) relating to or characteristic of the visual defect aniseikonia | - |
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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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| ankylose | (verb) undergo ankylosis | Synonyms: ancylose |
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| (verb) produce ankylosis by surgery | Synonyms: ancylose |
| ankylosis | (noun) abnormal adhesion and rigidity of the bones of a joint | Synonyms: anchylosis |
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| ankylotic | (adjective) relating to or characteristic of the abnormality ankylosis | - |
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| anorak | (noun) a kind of heavy jacket | Synonyms: parka, windbreaker, windcheater |
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| antiblack | (adjective) discriminatory especially on the basis of race or religion | Synonyms: anti-Semite, racist |
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| anticlockwise | (adjective) in the direction opposite to the rotation of the hands of a clock | Synonyms: contraclockwise, counterclockwise |
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| (adverb) in a direction opposite to the direction in which the hands of a clock move | Synonyms: counterclockwise |
| antiknock | (adjective) suppressing or eliminating engine knock in combustion engines | Synonyms: antiknocking |
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| (noun) any of various compounds that are added to gasoline to reduce engine knocking | - |
| antiknocking | (adjective) suppressing or eliminating engine knock in combustion engines | Synonyms: antiknock |
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| antiquark | (noun) the antiparticle of a quark | - |
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| antitank | (adjective) designed for defense against armored vehicles | - |
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| apelike | (adjective) being or given to servile imitation | Synonyms: apish |
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| (adjective) resembling apes | Synonyms: anthropoid, anthropoidal |
| aphakia | (noun) absence of the natural lens of the eye (usually resulting from the removal of cataracts) | - |
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| aphakic | (adjective) of or relating to or afflicted with aphakia | - |
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| (noun) someone afflicted by aphakia; someone lacking the natural lenses of the eyes | - |
| 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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| armlike | (adjective) resembling an arm | - |
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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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