| apivorous | (adjective) feeding on bees | - |
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| apocarpous | (adjective) (of ovaries of flowering plants) consisting of carpels that are free from one another as in buttercups or roses | - |
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| apocynaceous | (adjective) of or relating to tropical plants of the family Apocynaceae | - |
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| apodous | (adjective) (of snakes and eels) naturally footless | Synonyms: apodal |
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| apogamous | (adjective) of or relating to the development of an embryo in the absence of fertilization | Synonyms: apogametic, apogamic |
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| apparatus | (noun) equipment designed to serve a specific function | Synonyms: setup |
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| (noun) (anatomy) a group of body parts that work together to perform a given function | - |
| applause | (noun) a demonstration of approval by clapping the hands together | Synonyms: clapping, hand clapping |
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| apterous | (adjective) (of insects) without wings | Synonyms: apteral |
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| aqueous | (adjective) produced by the action of water | Synonyms: sedimentary |
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| (adjective) similar to or containing or dissolved in water | - |
| aquiferous | (adjective) of or relating to an aquifer | - |
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| araceous | (adjective) relating to a plant of the family Araceae | Synonyms: aroid |
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| arboraceous | (adjective) abounding in trees | Synonyms: arboreous, woodsy, woody |
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| arboreous | (adjective) inhabiting or frequenting trees | Synonyms: arboreal, tree-living |
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| (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arborescent, arboresque, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
| (adjective) abounding in trees | Synonyms: arboraceous, woodsy, woody |
| arborous | (adjective) of or relating to or formed by trees | Synonyms: arborary, arboreal, arborical |
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| arborvirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arbovirus |
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| arbovirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arborvirus |
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| arbutus | (noun) any of several evergreen shrubs of the genus Arbutus of temperate Europe and America | - |
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| arcus | (noun) a whitish deposit in the shape of an arc that is sometimes seen in the cornea | Synonyms: arcus senilis |
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| arduous | (adjective) difficult to accomplish; demanding considerable mental effort and skill | - |
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| (adjective) characterized by effort to the point of exhaustion; especially physical effort | Synonyms: backbreaking, grueling, gruelling, hard, heavy, laborious, operose, punishing, toilsome |
| (adjective) taxing to the utmost; testing powers of endurance | Synonyms: straining, strenuous |
| arduously | (adverb) in an arduous manner | - |
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| arduousness | (noun) extreme effortfulness | Synonyms: strenuousness |
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| arenaceous | (adjective) resembling or containing or abounding in sand; or growing in sandy areas | Synonyms: sandlike, sandy |
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| arenavirus | (noun) animal viruses belonging to the family Arenaviridae | - |
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| arenicolous | (adjective) growing or living or burrowing in sand | - |
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| arethusa | (noun) any of several bog orchids of the genus Arethusa having 1 or 2 showy flowers | - |
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| argentiferous | (adjective) containing or yielding silver | - |
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| argentous | (adjective) relating to compounds in which silver is univalent | - |
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| argillaceous | (adjective) resembling or containing clay | Synonyms: clayey |
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| argus | (noun) large brilliantly patterned East Indian pheasant | Synonyms: argus pheasant |
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| arousal | (noun) the act of arousing | Synonyms: rousing |
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| (noun) mutual sexual fondling prior to sexual intercourse | Synonyms: foreplay, stimulation |
| (noun) awakening from sleep | - |
| (noun) a state of heightened physiological activity | - |
| arouse | (verb) cause to be alert and energetic | Synonyms: brace, energise, energize, perk up, stimulate |
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| (verb) cause to become awake or conscious | Synonyms: awaken, rouse, wake, wake up, waken |
| (verb) stop sleeping | Synonyms: awake, awaken, come alive, wake, wake up, waken |
| (verb) summon into action or bring into existence, often as if by magic | Synonyms: bring up, call down, call forth, conjure, conjure up, evoke, invoke, put forward, raise, stir |
| (verb) call forth (emotions, feelings, and responses) | Synonyms: elicit, enkindle, evoke, fire, kindle, provoke, raise |
| (verb) to evoke sexual feelings | Synonyms: excite, sex, turn on, wind up |
| (verb) to begin moving | Synonyms: stir |
| aroused | (adjective) (of persons) excessively affected by emotion | Synonyms: emotional, excited, worked up |
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| (adjective) aroused to action | - |
| (adjective) emotionally aroused | Synonyms: stimulated, stirred, stirred up |
| (adjective) keenly excited (especially sexually) or indicating excitement | Synonyms: ablaze, aflame |
| (adjective) feeling great sexual desire | Synonyms: horny, randy, ruttish, steamy, turned on |
| (adjective) brought to a state of great tension | Synonyms: wound up |
| arouser | (noun) someone who rouses others from sleep | Synonyms: rouser, waker |
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| arquebus | (noun) an obsolete firearm with a long barrel | Synonyms: hackbut, hagbut, harquebus |
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| arsenious | (adjective) relating to compounds in which arsenic is trivalent | - |
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| arteriovenous | (adjective) connecting an artery to a vein | - |
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| arthropodous | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodal, arthropodan |
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| arthrosporous | (adjective) of or relating to arthrospores | Synonyms: arthrosporic |
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| artiodactylous | (adjective) of or relating to or belonging to mammals of the order Artiodactyla | Synonyms: artiodactyl, even-toed |
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| arundinaceous | (adjective) of or relating to or resembling reedlike plants of the genus Arundinaria | - |
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| asclepiadaceous | (adjective) of or relating to plants of the milkweed family | - |
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| ascocarpous | (adjective) of or relating to ascocarps | - |
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| ascomycetous | (adjective) related to or characteristic of fungi of the class Ascomycetes | - |
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| ascosporous | (adjective) of or relating to ascospores | Synonyms: ascosporic |
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| ascus | (noun) saclike structure in which ascospores are formed through sexual reproduction of ascomycetes | - |
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| asparagus | (noun) edible young shoots of the asparagus plant | - |
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| (noun) plant whose succulent young shoots are cooked and eaten as a vegetable | Synonyms: Asparagus officinales, edible asparagus |
| assiduous | (adjective) marked by care and persistent effort | Synonyms: sedulous |
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| assiduously | (adverb) with care and persistence | - |
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| assiduousness | (noun) great and constant diligence and attention | Synonyms: assiduity, concentration |
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| astomatous | (adjective) having no mouth or mouthlike opening | Synonyms: mouthless |
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| astragalus | (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: anklebone, astragal, talus |
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| asynchronous | (adjective) not synchronous; not occurring or existing at the same time or having the same period or phase | - |
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| (adjective) (digital communication) pertaining to a transmission technique that does not require a common clock between the communicating devices; timing signals are derived from special characters in the data stream itself | - |
| atheromatous | (adjective) of or relating to or resembling atheroma | Synonyms: atheromatic |
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| atrabilious | (adjective) irritable as if suffering from indigestion | Synonyms: bilious, dyspeptic, liverish |
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| atrocious | (adjective) provoking horror | Synonyms: frightful, horrible, horrifying, ugly |
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| (adjective) exceptionally bad or displeasing | Synonyms: abominable, awful, dreadful, painful, terrible, unspeakable |
| (adjective) shockingly brutal or cruel | Synonyms: flagitious, grievous, monstrous |
| atrociously | (adverb) in a terrible manner | Synonyms: abominably, abysmally, awfully, rottenly, terribly |
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| (adverb) to an extravagant or immoderate degree | Synonyms: outrageously |
| atrociousness | (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrocity, barbarity, barbarousness, heinousness |
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| audacious | (adjective) disposed to venture or take risks | Synonyms: daring, venturesome, venturous |
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| (adjective) invulnerable to fear or intimidation | Synonyms: brave, dauntless, fearless, hardy, intrepid, unfearing |
| (adjective) unrestrained by convention or propriety | Synonyms: bald-faced, barefaced, bodacious, brassy, brazen-faced, brazen, insolent |
| audaciously | (adverb) in an audacious manner | - |
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| audaciousness | (noun) fearless daring | Synonyms: audacity, temerity |
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| (noun) aggressive boldness or unmitigated effrontery | Synonyms: audacity |
| august | (adjective) profoundly honored | Synonyms: revered, venerable |
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| (adjective) of or befitting a lord | Synonyms: grand, lordly |
| auriferous | (adjective) containing gold | Synonyms: gold-bearing |
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| aurous | (adjective) of or relating to or containing or derived from gold | Synonyms: auric |
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| auscultate | (verb) examine by auscultation | - |
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| auscultation | (noun) listening to sounds within the body (usually with a stethoscope) | - |
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| auscultatory | (adjective) of or relating to auscultation | - |
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| auspex | (noun) (ancient Rome) a religious official who interpreted omens to guide public policy | Synonyms: augur |
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| auspicate | (verb) commence in a manner calculated to bring good luck | - |
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| (verb) indicate, as with a sign or an omen | Synonyms: augur, betoken, bode, forecast, foreshadow, foretell, omen, portend, predict, prefigure, presage, prognosticate |
| auspice | (noun) a favorable omen | - |
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| auspices | (noun) kindly endorsement and guidance | Synonyms: aegis, protection |
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| auspicious | (adjective) auguring favorable circumstances and good luck | - |
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| auspiciously | (adverb) in an auspicious manner | Synonyms: propitiously |
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| auspiciousness | (noun) the favorable quality of strongly indicating a successful result | Synonyms: propitiousness |
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| austenite | (noun) a solid solution of ferric carbide or carbon in iron; cools to form pearlite or martensite | - |
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| austenitic | (adjective) composed of austenite | - |
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| austere | (adjective) practicing great self-denial | Synonyms: ascetic, ascetical, spartan |
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| (adjective) of a stern or strict bearing or demeanor; forbidding in aspect | Synonyms: stern |
| (adjective) severely simple | Synonyms: severe, stark, stern |
| austerely | (adverb) in an austere fashion | - |
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| austereness | (noun) extreme plainness | Synonyms: severeness, severity |
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| austerity | (noun) the trait of great self-denial (especially refraining from worldly pleasures) | Synonyms: asceticism, nonindulgence |
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| austral | (adjective) of the south or coming from the south | - |
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| (noun) the basic unit of money in Argentina; equal to 100 centavos | - |
| australopithecine | (adjective) of or belonging to the hominid genus Australopithecus | - |
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| (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |
| 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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| autochthonous | (adjective) of rocks, deposits, etc.; found where they and their constituents were formed | - |
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| (adjective) originating where it is found | Synonyms: autochthonal, autochthonic, endemic, indigenous |
| autoecious | (adjective) of parasites especially rust fungi; completing the entire life cycle on a single host | Synonyms: homoecious |
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| autofocus | (noun) an optical device for focussing a camera or other instrument automatically | - |
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| autogamous | (adjective) characterized by or fit for autogamy | Synonyms: autogamic |
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| autogenous | (adjective) originating within the body | Synonyms: autogenic |
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| autoicous | (adjective) having male and female reproductive organs in separate clusters on the same plant | - |
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| autologous | (adjective) derived from organisms of the selfsame individual | - |
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| autonomous | (adjective) (of political bodies) not controlled by outside forces | Synonyms: independent, self-governing, sovereign |
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| (adjective) (of persons) free from external control and constraint in e.g. action and judgment | Synonyms: self-directed, self-reliant |
| (adjective) existing as an independent entity | - |
| avaricious | (adjective) immoderately desirous of acquiring e.g. wealth | Synonyms: covetous, grabby, grasping, greedy, prehensile |
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| avariciously | (adverb) in a greedy manner | Synonyms: covetously, greedily |
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| avariciousness | (noun) extreme greed for material wealth | Synonyms: avarice, covetousness, cupidity |
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| azygous | (adjective) occurring singly; not one of a pair | Synonyms: azygos |
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| babiroussa | (noun) Indonesian wild pig with enormous curved canine teeth | Synonyms: babirusa, babirussa, Babyrousa Babyrussa |
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| babirusa | (noun) Indonesian wild pig with enormous curved canine teeth | Synonyms: babiroussa, babirussa, Babyrousa Babyrussa |
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| babirussa | (noun) Indonesian wild pig with enormous curved canine teeth | Synonyms: babiroussa, babirusa, Babyrousa Babyrussa |
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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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| bacciferous | (adjective) producing or bearing berries | Synonyms: baccate, berried |
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| baccivorous | (adjective) feeding on berries | - |
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