| ankus | (noun) an elephant goad with a sharp spike and a hook | - |
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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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| annulus | (noun) (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar | Synonyms: skirt |
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| (noun) a toroidal shape | Synonyms: anchor ring, doughnut, halo, ring |
| anoestrous | (adjective) of or relating to anestrus | Synonyms: anestric, anestrous |
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| anoestrus | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anestrus, anoestrum |
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| anomalous | (adjective) deviating from the general or common order or type | - |
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| anonymous | (adjective) having no known name or identity or known source | Synonyms: anon. |
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| (adjective) not known or lacking marked individuality | - |
| anthophagous | (adjective) feeding on flowers | Synonyms: anthophilous |
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| anthophilous | (adjective) feeding on flowers | Synonyms: anthophagous |
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| anthropomorphous | (adjective) suggesting human characteristics for animals or inanimate things | Synonyms: anthropomorphic, humanlike |
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| anthropophagous | (adjective) of or relating to eaters of human flesh | - |
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| anthropophagus | (noun) a person who eats human flesh | Synonyms: anthropophagite, cannibal, man-eater |
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| antimonious | (adjective) relating to or derived from antimony | Synonyms: antimonic |
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| antonymous | (adjective) of words: having opposite meanings | - |
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| anurous | (adjective) not having a tail | Synonyms: tailless |
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| anus | (noun) the excretory opening at the end of the alimentary canal | - |
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| anxious | (adjective) eagerly desirous | Synonyms: dying |
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| (adjective) causing or fraught with or showing anxiety | Synonyms: nervous, queasy, uneasy, unquiet |
| apatosaurus | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaur, Apatosaurus excelsus, brontosaur, brontosaurus, thunder lizard |
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| apetalous | (adjective) (of flowers) having no petals | Synonyms: petalless |
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| aphyllous | (adjective) devoid of leaves | - |
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| 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 | - |
| 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 |
| 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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| 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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| 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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| 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 |
| 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 |
| 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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| auspicious | (adjective) auguring favorable circumstances and good luck | - |
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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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| 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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| azygous | (adjective) occurring singly; not one of a pair | Synonyms: azygos |
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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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| bacillus | (noun) aerobic rod-shaped spore-producing bacterium; often occurring in chainlike formations; found primarily in soil | Synonyms: B |
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| bacteriophagous | (adjective) of or relating to bacteriophages | Synonyms: bacteriophagic |
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| barbarous | (adjective) (of persons or their actions) able or disposed to inflict pain or suffering | Synonyms: brutal, cruel, fell, roughshod, savage, vicious |
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| (adjective) primitive in customs and culture | - |
| barosaurus | (noun) a dinosaur that could grow to be as tall as a building five stories tall | Synonyms: barosaur |
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| basidiomycetous | (adjective) pertaining to or characteristic of fungi of the class Basidiomycetes | - |
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| basidiosporous | (adjective) of or relating to or characterized by spores produced by basidia | - |
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| basileus | (noun) a ruler of the eastern Roman Empire | - |
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| beauteous | (adjective) (poetic) beautiful, especially to the sight | - |
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| betulaceous | (adjective) of or pertaining to or characteristic of trees of the birch family | - |
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| bibliolatrous | (adjective) given to Bible-worship | - |
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| bibulous | (adjective) given to or marked by the consumption of alcohol | Synonyms: boozy, drunken, sottish |
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| bicephalous | (adjective) having two heads | - |
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| bicornuous | (adjective) having two horns or horn-shaped parts | Synonyms: bicorn, bicornate, bicorned, bicornuate |
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| bigamous | (adjective) of illegal marriage to a second person while legally married to a first | - |
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| bignoniaceous | (adjective) of or pertaining to or characteristic of plants of the family Bignoniaceae | - |
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| bilious | (adjective) relating to or containing bile | Synonyms: biliary |
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| (adjective) irritable as if suffering from indigestion | Synonyms: atrabilious, dyspeptic, liverish |
| (adjective) suffering from or suggesting a liver disorder or gastric distress | Synonyms: liverish, livery |
| biogenous | (adjective) producing or produced by living things | - |
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| biparous | (adjective) producing two offspring at a time | Synonyms: twinning |
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