| ammonoid | (noun) one of the coiled chambered fossil shells of extinct mollusks | Synonyms: ammonite |
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| amrinone | (noun) a drug (trade name Inocor) used intravenously in heart failure; increases strength of contraction of myocardium | Synonyms: Inocor |
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| anachronous | (adjective) chronologically misplaced | Synonyms: anachronic, anachronistic |
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| anagnost | (noun) a cleric in the minor orders of the Eastern Orthodox Church who reads the lessons aloud in the liturgy (analogous to the lector in the Roman Catholic Church) | - |
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| andantino | (adjective) (of tempo) moderately fast | - |
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| androgenous | (adjective) of or related to androgenesis | Synonyms: androgenetic |
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| androgynous | (adjective) having both male and female characteristics | - |
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| (adjective) relating to or exhibiting both female and male sex organs but with a predominantly female appearance | - |
| anemoclinometer | (noun) A type of instrument which measures the inclination of the wind to the horizontal plane. | - |
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| anginose | (adjective) of or related to the pain of angina pectoris | Synonyms: anginal, anginous |
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| anginous | (adjective) of or related to the pain of angina pectoris | Synonyms: anginal, anginose |
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| annon | (noun) sweet pulpy tropical fruit with thick scaly rind and shiny black seeds | Synonyms: sugar apple, sweetsop |
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| annotate | (verb) provide interlinear explanations for words or phrases | Synonyms: comment, gloss |
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| (verb) add explanatory notes to or supply with critical comments | Synonyms: footnote |
| annotating | (noun) the act of adding notes | Synonyms: annotation |
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| annotation | (noun) the act of adding notes | Synonyms: annotating |
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| (noun) a comment or instruction (usually added) | Synonyms: notation, note |
| annotator | (noun) a commentator who writes notes to a text | - |
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| announce | (verb) make known; make an announcement | Synonyms: denote |
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| (verb) foreshadow or presage | Synonyms: annunciate, foretell, harbinger, herald |
| (verb) announce publicly or officially | Synonyms: declare |
| (verb) give the names of | - |
| announced | (adjective) declared publicly; made widely known | Synonyms: proclaimed |
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| announcement | (noun) a public statement containing information about an event that has happened or is going to happen | Synonyms: promulgation |
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| (noun) a formal public statement | Synonyms: annunciation, declaration, proclamation |
| announcer | (noun) reads news, commercials on radio or television | - |
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| (noun) someone who proclaims a message publicly | - |
| annoy | (verb) cause annoyance in; disturb, especially by minor irritations | Synonyms: bother, chafe, devil, get at, get to, gravel, irritate, nark, nettle, rag, rile, vex |
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| annoyance | (noun) the act of troubling or annoying someone | Synonyms: annoying, irritation, vexation |
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| (noun) something or someone that causes trouble; a source of unhappiness | Synonyms: bother, botheration, infliction, nuisance, pain, pain in the ass, pain in the neck |
| (noun) anger produced by some annoying irritation | Synonyms: chafe, vexation |
| (noun) an unpleasant person who is annoying or exasperating | Synonyms: aggravator |
| (noun) the psychological state of being irritated or annoyed | Synonyms: botheration, irritation, vexation |
| annoyed | (adjective) aroused to impatience or anger | Synonyms: irritated, miffed, nettled, peeved, pissed, pissed off, riled, roiled, steamed, stung |
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| (adjective) troubled persistently especially with petty annoyances | Synonyms: harassed, harried, pestered, vexed |
| annoyer | (noun) someone given to teasing (as by mocking or stirring curiosity) | Synonyms: tease, teaser, vexer |
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| annoying | (adjective) causing irritation or annoyance | Synonyms: bothersome, galling, irritating, nettlesome, pesky, pestering, pestiferous, plaguey, plaguy, teasing, vexatious, vexing |
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| (noun) the act of troubling or annoying someone | Synonyms: annoyance, irritation, vexation |
| annoyingly | (adverb) in an annoying manner or to an annoying degree | - |
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| anoa | (noun) small buffalo of the Celebes having small straight horns | Synonyms: Anoa depressicornis, dwarf buffalo |
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| anodal | (adjective) of or at or relating to an anode | Synonyms: anodic |
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| anode | (noun) a positively charged electrode by which electrons leave an electrical device | - |
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| (noun) the negatively charged terminal of a voltaic cell or storage battery that supplies current | - |
| anodic | (adjective) of or at or relating to an anode | Synonyms: anodal |
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| anodise | (verb) coat a metal with an oxide coat | Synonyms: anodize |
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| anodize | (verb) coat a metal with an oxide coat | Synonyms: anodise |
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| anodyne | (adjective) capable of relieving pain | Synonyms: analgesic, analgetic |
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| (noun) a medicine used to relieve pain | Synonyms: analgesic, pain pill, painkiller |
| anoestrous | (adjective) of or relating to anestrus | Synonyms: anestric, anestrous |
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| anoestrum | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anestrus, anoestrus |
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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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| anoint | (verb) administer an oil or ointment to; often in a religious ceremony of blessing | Synonyms: anele, embrocate, inunct, oil |
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| (verb) choose by or as if by divine intervention | - |
| anointer | (noun) one who anoints as a religious ceremony | - |
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| anointing | (noun) the act of applying oil or an oily liquid | Synonyms: anointment |
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| anointment | (noun) the act of applying oil or an oily liquid | Synonyms: anointing |
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| anole | (noun) small arboreal tropical American insectivorous lizards with the ability to change skin color | Synonyms: American chameleon, Anolis carolinensis |
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| anomalist | (noun) someone who has a special interest in exceptional cases | - |
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| anomalops | (noun) fish having a luminous organ beneath eye; of warm waters of the western Pacific and Puerto Rico | Synonyms: flashlight fish |
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| anomalopteryx | (noun) the smallest moa; slender moa about the size of a large turkey | Synonyms: Anomalopteryx oweni |
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| anomalous | (adjective) deviating from the general or common order or type | - |
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| anomalously | (adverb) in an anomalous manner | - |
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| anomalousness | (noun) deviation from the normal or common order or form or rule | Synonyms: anomaly |
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| anomaly | (noun) (astronomy) position of a planet as defined by its angular distance from its perihelion (as observed from the sun) | - |
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| (noun) a person who is unusual | Synonyms: unusual person |
| (noun) deviation from the normal or common order or form or rule | Synonyms: anomalousness |
| anomia | (noun) inability to name objects or to recognize written or spoken names of objects | Synonyms: amnesic aphasia, amnestic aphasia, anomic aphasia, nominal aphasia |
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| anomic | (adjective) socially disoriented | Synonyms: alienated, disoriented |
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| anomie | (noun) lack of moral standards in a society | Synonyms: anomy |
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| (noun) personal state of isolation and anxiety resulting from a lack of social control and regulation | Synonyms: anomy |
| anomy | (noun) lack of moral standards in a society | Synonyms: anomie |
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| (noun) personal state of isolation and anxiety resulting from a lack of social control and regulation | Synonyms: anomie |
| anon | (adverb) (old-fashioned or informal) in a little while | - |
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| (adverb) at another time | - |
| anonym | (noun) a fictitious name used when the person performs a particular social role | Synonyms: nom de guerre, pseudonym |
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| anonymity | (noun) the state of being anonymous | Synonyms: namelessness |
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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 | - |
| anonymously | (adverb) without giving a name | - |
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| anoperineal | (adjective) relating to the anus and surrounding perineum | - |
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| anopheline | (adjective) relating to or characteristic of malaria mosquitoes | - |
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| (noun) any mosquito of the genus Anopheles | - |
| anopia | (noun) sightlessness (especially because of a structural defect in or the absence of an eye) | - |
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| anorak | (noun) a kind of heavy jacket | Synonyms: parka, windbreaker, windcheater |
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| anorchia | (noun) absence of one of both testes | Synonyms: anorchidism, anorchism |
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| anorchidism | (noun) absence of one of both testes | Synonyms: anorchia, anorchism |
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| anorchism | (noun) absence of one of both testes | Synonyms: anorchia, anorchidism |
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| anorectal | (adjective) pertaining to the anus and rectum considered together | - |
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| anorectic | (adjective) causing loss of appetite | Synonyms: anorexigenic |
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| (adjective) suffering from anorexia nervosa; pathologically thin | Synonyms: anorexic |
| (noun) a person suffering from anorexia nervosa | Synonyms: anorexic |
| anorexia | (noun) a prolonged disorder of eating due to loss of appetite | - |
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| anorexic | (adjective) suffering from anorexia nervosa; pathologically thin | Synonyms: anorectic |
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| (noun) a person suffering from anorexia nervosa | Synonyms: anorectic |
| anorexigenic | (adjective) causing loss of appetite | Synonyms: anorectic |
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| anorgasmia | (noun) absence of an orgasm in sexual relations | - |
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| anorthic | (adjective) having three unequal crystal axes intersecting at oblique angles | Synonyms: triclinic |
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| anorthite | (noun) rare plagioclastic feldspar occurring in many igneous rocks | - |
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| anorthitic | (adjective) characteristic of anorthite | - |
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| anorthography | (noun) a loss of the ability to write or to express thoughts in writing because of a brain lesion | Synonyms: agraphia, logagraphia |
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| anorthopia | (noun) distorted vision in which straight lines appear curved | - |
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| anosmatic | (adjective) relating to an impairment or loss of the sense of smell | Synonyms: anosmic |
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| 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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| anosmic | (adjective) relating to an impairment or loss of the sense of smell | Synonyms: anosmatic |
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| (adjective) having impaired sense of smell | - |
| another | (adjective) any of various alternatives; some other; entity, singular, other pronoun; quantifier, singular, another | Synonyms: some other |
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| anovulant | (noun) a contraceptive in the form of a pill containing estrogen and progestin to inhibit ovulation and so prevent conception | Synonyms: anovulatory drug, birth control pill, contraceptive pill, oral contraceptive, oral contraceptive pill, pill |
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| anovulation | (noun) the absence of ovulation due to immaturity or post-maturity or pregnancy or oral contraceptive pills or dysfunction of the ovary | - |
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| anoxemia | (noun) abnormally low oxygen content in arterial blood | - |
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| anoxemic | (adjective) relating to or marked by abnormally little oxygen 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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| anoxic | (adjective) relating to or marked by a severe deficiency of oxygen in tissues or organs | - |
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| 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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| antimonopoly | (adjective) of laws and regulations; designed to protect trade and commerce from unfair business practices | Synonyms: antitrust |
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| antineutrino | (noun) the antiparticle of a neutrino | - |
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| antinode | (noun) (physics) the point of maximum displacement in a periodic system | - |
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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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| antinomy | (noun) a contradiction between two statements that seem equally reasonable | - |
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| apnoeic | (adjective) of or relating to apnea | Synonyms: apneic |
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| arachnoid | (adjective) relating to or resembling a member of the class Arachnida | Synonyms: arachnidian, spiderlike, spiderly, spidery |
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| (noun) air-breathing arthropods characterized by simple eyes and four pairs of legs | Synonyms: arachnid |
| (noun) the middle of the 3 meninges | Synonyms: arachnoid membrane |
| arachnophobia | (noun) a morbid fear of spiders | - |
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| argentinosaur | (noun) huge herbivorous dinosaur of Cretaceous found in Argentina | - |
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| argonon | (noun) any of the chemically inert gaseous elements of the helium group in the periodic table | Synonyms: inert gas, noble gas |
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| arsenopyrite | (noun) a silver-white or grey ore of arsenic | Synonyms: mispickel |
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| arteriovenous | (adjective) connecting an artery to a vein | - |
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