| anthropogenesis | (noun) the evolution or genesis of the human race | Synonyms: anthropogeny |
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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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| antibiosis | (noun) an association between organisms that is harmful to one of them or between organisms and a metabolic product of another | - |
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| antimetathesis | (noun) A rhetorical figure resulting from a reverted arrangement in the last clause of a sentence of the two principal words of the clause preceding; inversion of the members of an antithesis: as, "A poem is a speaking picture; a picture a mute poem". | - |
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| antimonious | (adjective) relating to or derived from antimony | Synonyms: antimonic |
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| antiphrasis | (noun) the use of a word in a sense opposite to its normal sense (especially in irony) | - |
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| antipodes | (noun) any two places or regions on diametrically opposite sides of the Earth | - |
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| antipyresis | (noun) medication with antipyretics to treat a fever | - |
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| antiquatedness | (noun) The state or quality of being outmoded or discredited by reason of age, of being out of style or fashion. | - |
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| antiqueness | (noun) the quality or state of being in the style or fashion of former times. | - |
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| antireligiousness | (noun) The state or condition of being opposed to religion. | - |
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| antisepsis | (noun) the process of inhibiting the growth and multiplication of microorganisms | Synonyms: asepsis |
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| (noun) (of non-living objects) the state of being free of pathogenic organisms | Synonyms: asepsis, sterileness, sterility |
| antithesis | (noun) the juxtaposition of contrasting words or ideas to give a feeling of balance | - |
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| (noun) exact opposite | - |
| antitrades | (noun) wind in the upper atmosphere blowing above but in the opposite direction from the trade winds | - |
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| antonymous | (adjective) of words: having opposite meanings | - |
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| anuresis | (noun) inability to urinate | Synonyms: anuria |
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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 |
| anxiousness | (noun) a feeling of mild anxiety about possible developments | Synonyms: disquiet |
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| (noun) (psychiatry) a relatively permanent state of worry and nervousness occurring in a variety of mental disorders, usually accompanied by compulsive behavior or attacks of panic | Synonyms: anxiety |
| anyways | (adverb) used to indicate that a statement explains or supports a previous statement | Synonyms: anyhow, anyway, at any rate, in any case, in any event |
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| aortitis | (noun) inflammation of the aorta | - |
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| 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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| aphaeresis | (noun) (linguistics) omission at the beginning of a word as in `coon' for `raccoon' or `till' for `until' | Synonyms: apheresis |
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| apheresis | (noun) a procedure in which blood is drawn and separated into its components by dialysis; some are retained and the rest are returned to the donor by transfusion | Synonyms: pheresis |
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| (noun) (linguistics) omission at the beginning of a word as in `coon' for `raccoon' or `till' for `until' | Synonyms: aphaeresis |
| aphesis | (noun) the gradual disappearance of an initial (usually unstressed) vowel or syllable as in `squire' for `esquire' | - |
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| aphyllous | (adjective) devoid of leaves | - |
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| apivorous | (adjective) feeding on bees | - |
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| apoapsis | (noun) (astronomy) the point in an orbit farthest from the body being orbited | Synonyms: point of apoapsis |
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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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| apocryphalness | (noun) The property of being of doubtful authenticity, of lacking authority, or of not being regarded as canonical. | - |
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| (noun) The property of being of dubious veracity; of questionable accuracy or truthfulness. | - |
| 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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| apologetics | (noun) the branch of theology that is concerned with the defense of Christian doctrines | - |
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| apomixis | (noun) any of several kinds of reproduction without fertilization | - |
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| aponeurosis | (noun) any of the deeper and thicker fascia that attach muscles to bones; resemble flattened tendons | - |
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| apophasis | (noun) mentioning something by saying it will not be mentioned | - |
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| apophysis | (noun) (anatomy) a natural outgrowth or projection on an organ or body part such as the process of a vertebra | - |
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| (noun) (botany) a natural swelling or enlargement: at the base of the stalk or seta in certain mosses or on the cone scale of certain conifers | - |
| apoptosis | (noun) a type of cell death in which the cell uses specialized cellular machinery to kill itself; a cell suicide mechanism that enables metazoans to control cell number and eliminate cells that threaten the animal's survival | Synonyms: caspase-mediated cell death, programmed cell death |
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| aposiopesis | (noun) breaking off in the middle of a sentence (as by writers of realistic conversations) | - |
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| apotheosis | (noun) the elevation of a person (as to the status of a god) | Synonyms: deification, exaltation |
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| (noun) model of excellence or perfection of a kind; one having no equal | Synonyms: ideal, nonesuch, nonpareil, nonsuch, paragon, saint |
| 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 | - |
| apparentness | (noun) the property of being apparent | Synonyms: apparency |
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| appealingness | (noun) attractiveness that interests or pleases or stimulates | Synonyms: appeal, charm |
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| appendicitis | (noun) inflammation of the vermiform appendix | - |
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| appetisingness | (noun) the property of stimulating the appetite | Synonyms: appetizingness |
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| appetizingness | (noun) the property of stimulating the appetite | Synonyms: appetisingness |
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| appositeness | (noun) appropriateness for the occasion | Synonyms: aptness |
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| appreciativeness | (noun) warm friendly feelings of gratitude | Synonyms: gratefulness, thankfulness |
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| apprehensiveness | (noun) fearful expectation or anticipation | Synonyms: apprehension, dread |
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| appropriateness | (noun) the quality of being specially suitable | - |
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| (noun) appropriate conduct; doing the right thing | Synonyms: rightness |
| apropos | (adjective) of an appropriate or pertinent nature | - |
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| (adverb) at an opportune time | Synonyms: seasonably, timely, well-timed |
| (adverb) introducing a different topic | Synonyms: by the bye, by the way, incidentally |
| apsis | (noun) a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar | Synonyms: apse |
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| apterous | (adjective) (of insects) without wings | Synonyms: apteral |
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| aptness | (noun) appropriateness for the occasion | Synonyms: appositeness |
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| (noun) a disposition to behave in a certain way | Synonyms: propensity |
| aquatics | (noun) sports that involve bodies of water | Synonyms: water sport |
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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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| arbitrariness | (noun) the trait of acting unpredictably and more from whim or caprice than from reason or judgment | Synonyms: capriciousness, flightiness, whimsey, whimsicality, whimsy |
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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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| arccos | (noun) the inverse function of the cosine; the angle that has a cosine equal to a given number | Synonyms: arc cosine, arccosine, inverse cosine |
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| archaeornis | (noun) extinct primitive toothed bird with a long feathered tail and three free clawed digits on each wing | - |
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| archduchess | (noun) a wife or widow of an archduke or a princess of the former ruling house of Austria | - |
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| architectonics | (noun) the science of architecture | Synonyms: tectonics |
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| architeuthis | (noun) largest mollusk known about but never seen (to 60 feet long) | Synonyms: giant squid |
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| archives | (noun) collection of records especially about an institution | - |
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| archness | (noun) inappropriate playfulness | Synonyms: impertinence, perkiness, pertness, sauciness |
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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 |
| 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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| 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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| aridness | (noun) a deficiency of moisture (especially when resulting from a permanent absence of rainfall) | Synonyms: aridity, thirstiness |
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| arles | (noun) money given by a buyer to a seller to bind a contract | Synonyms: earnest money |
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| armless | (adjective) having no arms | - |
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| arms | (noun) weapons considered collectively | Synonyms: implements of war, munition, weaponry, weapons system |
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| (noun) the official symbols of a family, state, etc. | Synonyms: blazon, blazonry, coat of arms |
| arquebus | (noun) an obsolete firearm with a long barrel | Synonyms: hackbut, hagbut, harquebus |
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| arras | (noun) a wall hanging of heavy handwoven fabric often with pictorial designs | Synonyms: tapestry |
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| arrears | (noun) an unpaid overdue debt | - |
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| (noun) the state of being behind in payments | - |
| arsenious | (adjective) relating to compounds in which arsenic is trivalent | - |
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| arteriectasis | (noun) an abnormal distension of an artery | Synonyms: arteriectasia |
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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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| arteriovenous | (adjective) connecting an artery to a vein | - |
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| arteritis | (noun) inflammation of an artery | - |
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