| anosmia | (noun) absence of the sense of smell (as by damage to olfactory nasal tissue or the olfactory nerve or by obstruction of the nasal passages) | - |
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| anoxemia | (noun) abnormally low oxygen content in arterial blood | - |
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| anoxia | (noun) severe hypoxia; absence of oxygen in inspired gases or in arterial blood or in the tissues | - |
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| antediluvial | (adjective) of or relating to the period before the biblical flood | Synonyms: antediluvian |
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| antediluvian | (adjective) of or relating to the period before the biblical flood | Synonyms: antediluvial |
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| (adjective) so extremely old as seeming to belong to an earlier period | Synonyms: antiquated, archaic |
| (noun) a very old person | Synonyms: ancient |
| (noun) any of the early patriarchs who lived prior to the Noachian deluge | Synonyms: antediluvian patriarch |
| antemeridian | (adjective) before noon | - |
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| antenuptial | (adjective) relating to events before a marriage | Synonyms: premarital, prenuptial |
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| antheridial | (adjective) relating to or characterized by an antheridium | - |
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| antiacid | (noun) an agent that counteracts or neutralizes acidity (especially in the stomach) | Synonyms: alkaliser, alkalizer, antacid, gastric antacid |
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| antiadrenergic | (adjective) relating to blocking or reducing adrenergic effects in the body | - |
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| antiaircraft | (adjective) designed for defense from a surface position against air attack | - |
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| (noun) artillery designed to shoot upward at airplanes | Synonyms: ack-ack, ack-ack gun, antiaircraft gun, flack, flak, pom-pom |
| antialiasing | (noun) (computer graphics) a technique that is used to smooth jagged distortions in curves and diagonal lines so they appear smoother | - |
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| antiapartheid | (adjective) opposing the policy of apartheid in South Africa | - |
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| antiarrhythmic | (noun) a drug used to treat an abnormal heart rhythm | Synonyms: antiarrhythmic drug, antiarrhythmic medication |
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| antiauthoritarian | (adjective) opposed to authoritarianism | - |
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| antibacterial | (adjective) destroying bacteria or inhibiting their growth | - |
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| (noun) any drug that destroys bacteria or inhibits their growth | Synonyms: antibacterial drug, bactericide |
| antidiabetic | (noun) a drug used to treat diabetes mellitus | Synonyms: antidiabetic drug |
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| antidiarrheal | (noun) a drug used to control or stop diarrhea | Synonyms: antidiarrheal drug |
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| antiestablishmentarianism | (noun) the doctrine of opposition to the social and political establishment | Synonyms: antiestablishmentism |
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| antimalarial | (noun) a medicinal drug used to prevent or treat malaria | Synonyms: antimalarial drug |
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| antimicrobial | (adjective) capable of destroying or inhibiting the growth of disease-causing microorganisms | Synonyms: antimicrobic |
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| (noun) an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease | Synonyms: antimicrobic, disinfectant, germicide |
| antimonial | (adjective) containing antimony | - |
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| antinomasia | (noun) substitution of a title for a name | - |
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| antinomian | (adjective) relating to or influenced by antinomianism | - |
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| (noun) a follower of the doctrine of antinomianism | - |
| antinomianism | (noun) the theological doctrine that by faith and God's grace a Christian is freed from all laws (including the moral standards of the culture) | - |
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| antiquarian | (adjective) of or relating to antiques or antiquities | - |
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| (adjective) of or relating to persons who study or deal in antiques or antiquities | - |
| (noun) an expert or collector of antiquities | Synonyms: antiquary, archaist |
| antisocial | (adjective) shunning contact with others | - |
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| (adjective) hostile to or disruptive of normal standards of social behavior | Synonyms: asocial |
| anuria | (noun) inability to urinate | Synonyms: anuresis |
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| aphagia | (noun) loss of the ability to swallow | - |
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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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| aphasia | (noun) inability to use or understand language (spoken or written) because of a brain lesion | - |
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| aphonia | (noun) a disorder of the vocal organs that results in the loss of voice | Synonyms: voicelessness |
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| aphrodisia | (noun) a desire for heterosexual intimacy | - |
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| aphrodisiac | (adjective) stimulating sexual desire | Synonyms: aphrodisiacal, sexy |
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| (noun) a drug or other agent that stimulates sexual desire | - |
| aphrodisiacal | (adjective) stimulating sexual desire | Synonyms: aphrodisiac, sexy |
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| apian | (adjective) relating to or having the characteristics of bees | - |
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| apiarian | (adjective) relating to bees or beekeeping | - |
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| apiarist | (noun) a farmer who keeps bees for their honey | Synonyms: apiculturist, beekeeper |
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| apiary | (noun) a shed containing a number of beehives | Synonyms: bee house |
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| aplasia | (noun) failure of some tissue or organ to develop | - |
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| apolemia | (noun) large siphonophore of up to 50 ft long | - |
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| apologia | (noun) a formal written defense of something you believe in strongly | Synonyms: apology |
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| apothecial | (adjective) of or relating to the apothecium of some lichens and fungi | - |
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| appendicularia | (noun) free-swimming tadpole-shaped pelagic tunicate resembling larvae of other tunicates | - |
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| appliance | (noun) durable goods for home or office use | - |
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| (noun) a device or control that is very useful for a particular job | Synonyms: contraption, contrivance, convenience, gadget, gismo, gizmo, widget |
| appoggiatura | (noun) an embellishing note usually written in smaller size | Synonyms: acciaccatura, grace note |
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| appreciable | (adjective) enough to be estimated or measured | - |
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| appreciably | (adverb) to a noticeable degree | - |
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| appreciate | (verb) gain in value | Synonyms: apprise, apprize, revalue |
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| (verb) increase the value of | Synonyms: apprise, apprize |
| (verb) be fully aware of; realize fully | Synonyms: take account |
| (verb) recognize with gratitude; be grateful for | - |
| (verb) hold dear | Synonyms: prize, treasure, value |
| appreciated | (adjective) fully understood or grasped | Synonyms: apprehended, comprehended |
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| appreciation | (noun) a favorable judgment | Synonyms: admiration |
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| (noun) an increase in price or value | - |
| (noun) understanding of the nature or meaning or quality or magnitude of something | Synonyms: grasp, hold |
| (noun) delicate discrimination (especially of esthetic values) | Synonyms: discernment, perceptiveness, taste |
| (noun) an expression of gratitude | - |
| appreciative | (adjective) having or showing appreciation or a favorable critical judgment or opinion | - |
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| (adjective) feeling or expressive of gratitude | - |
| appreciatively | (adverb) with appreciation; in a grateful manner | Synonyms: gratefully |
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| appreciativeness | (noun) warm friendly feelings of gratitude | Synonyms: gratefulness, thankfulness |
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| appreciator | (noun) a person who is fully aware of something and understands it | - |
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| appropriable | (adjective) that can be appropriated | - |
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| appropriate | (adjective) suitable for a particular person or place or condition etc | - |
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| (adjective) meant or adapted for an occasion or use | Synonyms: suitable, suited |
| (verb) give or assign a resource to a particular person or cause | Synonyms: allow, earmark, reserve, set aside |
| (verb) take possession of by force, as after an invasion | Synonyms: capture, conquer, seize |
| appropriately | (adverb) in accordance with what is appropriate or suitable for the circumstances | Synonyms: befittingly, duly, fitly, fittingly, properly, suitably |
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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 |
| appropriation | (noun) a deliberate act of acquisition of something, often without the permission of the owner | - |
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| (noun) incorporation by joining or uniting | Synonyms: annexation |
| (noun) money set aside (as by a legislature) for a specific purpose | - |
| appropriative | (adjective) of or relating to or given to the act of taking for yourself | - |
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| appropriator | (noun) someone who takes for his or her own use (especially without permission) | - |
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| apraxia | (noun) inability to make purposeful movements | - |
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| aquaphobia | (noun) a morbid fear of drowning | - |
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| aquilegia | (noun) a plant of the genus Aquilegia having irregular showy spurred flowers; north temperate regions especially mountains | Synonyms: aquilege, columbine |
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| arachnidian | (adjective) relating to or resembling a member of the class Arachnida | Synonyms: arachnoid, spiderlike, spiderly, spidery |
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| arachnophobia | (noun) a morbid fear of spiders | - |
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| aralia | (noun) any of various plants of the genus Aralia; often aromatic plants having compound leaves and small umbellate flowers | - |
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| araucaria | (noun) any of several tall South American or Australian trees with large cones and edible seeds | - |
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| arcadian | (adjective) (used with regard to idealized country life) idyllically rustic | Synonyms: bucolic, pastoral |
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| archaebacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacterium, archaeobacteria, archeobacteria |
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| archaeobacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaebacterium, archeobacteria |
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| archegonial | (adjective) of or relating to an archegonium | Synonyms: archegoniate |
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| archegoniate | (adjective) of or relating to an archegonium | Synonyms: archegonial |
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| archeobacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaebacterium, archaeobacteria |
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| archesporial | (adjective) of or relating to the cells in a sporangium that give rise to spores | - |
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| archiannelid | (noun) small primitive marine worm lacking external segmentation and resembling polychaete larvae | - |
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| archidiaconal | (adjective) of or relating to an archdeacon or his office | - |
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| archidiaconate | (noun) office or position of an archdeacon | - |
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| archosaurian | (adjective) of or relating to reptiles of the subclass Archosauria | - |
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| (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaur, archosaurian reptile |
| areflexia | (noun) absence of a reflex; a sign of possible nerve damage | - |
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| aria | (noun) an elaborate song for solo voice | - |
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| arianist | (noun) an adherent of Arianism (the belief that Jesus Christ was not truly God) | - |
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| arithmetician | (noun) someone who specializes in arithmetic | - |
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| armorial | (adjective) of or relating to heraldry or heraldic arms | - |
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| arrhythmia | (noun) an abnormal rate of muscle contractions in the heart | Synonyms: cardiac arrhythmia |
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| artemisia | (noun) any of various composite shrubs or herbs of the genus Artemisia having aromatic green or greyish foliage | - |
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| arteria | (noun) a blood vessel that carries blood from the heart to the body | Synonyms: arterial blood vessel, artery |
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| arterial | (adjective) of or involving or contained in the arteries | - |
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| arterialise | (verb) change venous blood into arterial blood | Synonyms: arterialize |
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| arterialize | (verb) change venous blood into arterial blood | Synonyms: arterialise |
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| arteriectasia | (noun) an abnormal distension of an artery | Synonyms: arteriectasis |
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| artesian | (adjective) (of water) rising to the surface under internal hydrostatic pressure | - |
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| arthralgia | (noun) pain in a joint or joints | - |
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| artificial | (adjective) contrived by art rather than nature | Synonyms: unreal |
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| (adjective) artificially formal | Synonyms: contrived, hokey, stilted |
| (adjective) not arising from natural growth or characterized by vital processes | - |
| artificialism | (noun) Czech surrealism founded in 1928 by Jindrich Styrsky and Toyen (Marie Cerminova). | - |
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| artificiality | (noun) the quality of being produced by people and not occurring naturally | - |
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| artificially | (adverb) not according to nature; not by natural means | Synonyms: by artificial means, unnaturally |
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| ascariasis | (noun) infestation of the human intestine with Ascaris roundworms | - |
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| ascidian | (noun) minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves | - |
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