| aberrant | (adjective) markedly different from an accepted norm | Synonyms: deviant, deviate |
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| (noun) one whose behavior departs substantially from the norm of a group | - |
| abeyant | (adjective) inactive but capable of becoming active | Synonyms: dormant |
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| abradant | (noun) a tool or machine used for wearing down or smoothing or polishing | Synonyms: abrader |
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| (noun) a substance that abrades or wears down | Synonyms: abrasive, abrasive material |
| abundant | (adjective) present in great quantity | - |
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| abundantly | (adverb) in an abundant manner | Synonyms: copiously, extravagantly, profusely |
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| acantha | (noun) any sharply pointed projection | Synonyms: spine, spur |
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| acanthion | (noun) the craniometric point at the anterior extremity of the intermaxillary suture | - |
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| acanthocephalan | (noun) any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines | Synonyms: spiny-headed worm |
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| acanthocyte | (noun) an abnormal red blood cell that has thorny projections of protoplasm | - |
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| acanthocytosis | (noun) the presence of acanthocytes in the blood stream (as in abetalipoproteinemia) | - |
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| acanthoid | (adjective) shaped like a spine or thorn | Synonyms: acanthous, spinous |
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| acantholysis | (noun) a breakdown of a cell layer in the epidermis (as in pemphigus) | - |
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| acanthoma | (noun) a neoplasm originating in the epidermis | Synonyms: skin tumor |
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| acanthopterygian | (noun) a teleost fish with fins that are supported by sharp inflexible rays | Synonyms: spiny-finned fish |
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| acanthosis | (noun) an abnormal but benign thickening of the prickle-cell layer of the skin (as in psoriasis) | - |
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| acanthotic | (adjective) of or relating to or having acanthosis | - |
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| acanthous | (adjective) shaped like a spine or thorn | Synonyms: acanthoid, spinous |
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| acanthus | (noun) any plant of the genus Acanthus having large spiny leaves and spikes or white or purplish flowers; native to Mediterranean region but widely cultivated | - |
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| acceptant | (adjective) accepting willingly | Synonyms: acceptive |
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| accordant | (adjective) being in agreement or harmony; often followed by `with' | - |
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| (adjective) in keeping | Synonyms: agreeable, concordant, conformable, consonant |
| accountant | (noun) someone who maintains and audits business accounts | Synonyms: comptroller, controller |
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| accountantship | (noun) the position of accountant | - |
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| adamant | (adjective) impervious to pleas, persuasion, requests, reason | Synonyms: adamantine, inexorable, intransigent |
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| (noun) very hard native crystalline carbon valued as a gem | Synonyms: diamond |
| adamantine | (adjective) consisting of or having the hardness of adamant | - |
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| (adjective) having the hardness of a diamond | - |
| (adjective) impervious to pleas, persuasion, requests, reason | Synonyms: adamant, inexorable, intransigent |
| adamantly | (adverb) inflexibly; unshakably | - |
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| adjutant | (noun) large Indian stork with a military gait | Synonyms: adjutant bird, adjutant stork, Leptoptilus dubius |
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| (noun) an officer who acts as military assistant to a more senior officer | Synonyms: aide-de-camp, aide |
| adjuvant | (adjective) enhancing the action of a medical treatment | - |
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| (adjective) furnishing added support | Synonyms: accessory, adjunct, ancillary, appurtenant, auxiliary |
| (noun) an additive that enhances the effectiveness of medical treatment | - |
| adulterant | (adjective) making impure or corrupt by adding extraneous materials | Synonyms: adulterating |
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| (noun) any substance that lessens the purity or effectiveness of a substance | Synonyms: adulterator |
| advantage | (noun) the quality of having a superior or more favorable position | Synonyms: vantage |
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| (noun) benefit resulting from some event or action | Synonyms: reward |
| (noun) (tennis) first point scored after deuce | - |
| (verb) give an advantage to | - |
| advantageous | (adjective) giving an advantage | Synonyms: favorable, favourable |
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| (adjective) appropriate for achieving a particular end; implies a lack of concern for fairness | - |
| advantageously | (adverb) in a manner affording benefit or advantage | Synonyms: well |
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| advantageousness | (noun) the quality of being encouraging or promising of a successful outcome | Synonyms: favorableness, favourableness, positiveness, positivity, profitableness |
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| aeschynanthus | (noun) a plant of the genus Aeschynanthus having somewhat red or orange flowers and seeds having distinctive hairs at base and apex | - |
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| affiant | (noun) a person who makes an affidavit | - |
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| agapanthus | (noun) any of various plants of the genus Agapanthus having umbels of showy blue to purple flowers | Synonyms: lily of the Nile |
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| ailanthus | (noun) any of several deciduous Asian trees of the genus Ailanthus | - |
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| aliquant | (noun) an integer that is not an exact divisor of some quantity | Synonyms: aliquant part |
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| allantoic | (adjective) relating to or characterized by an allantois | - |
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| allantoid | (adjective) shaped like a sausage | Synonyms: sausage-shaped |
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| allantois | (noun) the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals) | - |
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| allegiant | (adjective) steadfast in devotion (especially to your lawful monarch or government) | - |
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| alleviant | (noun) remedy that alleviates pain without curing | Synonyms: alleviator, palliative |
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| alloantibody | (noun) an antibody that occurs naturally against foreign tissues from a person of the same species | Synonyms: isoantibody |
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| amaranth | (noun) any of various plants of the genus Amaranthus having dense plumes of green or red flowers; often cultivated for food | - |
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| (noun) seed of amaranth plants used as a native cereal in Central and South America | - |
| amaranthine | (adjective) of or related to the amaranth plant | - |
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| (adjective) of an imaginary flower that never fades | Synonyms: unfading |
| ambulant | (adjective) able to walk about | Synonyms: ambulatory |
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| andante | (adjective) (of tempo) moderately slow | - |
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| (noun) a musical composition or musical passage to be performed moderately slow | - |
| (noun) a moderately slow tempo (a walking pace) | - |
| (adverb) at a moderately slow tempo | - |
| andantino | (adjective) (of tempo) moderately fast | - |
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| angwantibo | (noun) a kind of yellow or golden lemur (Arctocebus calabarensis) | Synonyms: Arctocebus calabarensis, golden potto |
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| annuitant | (noun) the recipient of an annuity | - |
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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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| ant | (noun) social insect living in organized colonies; characteristically the males and fertile queen have wings during breeding season; wingless sterile females are the workers | Synonyms: emmet, pismire |
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| antacid | (adjective) acting to neutralize acid (especially in the stomach) | - |
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| (noun) an agent that counteracts or neutralizes acidity (especially in the stomach) | Synonyms: alkaliser, alkalizer, antiacid, gastric antacid |
| antagonise | (verb) provoke the hostility of | Synonyms: antagonize |
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| (verb) act in opposition to | Synonyms: antagonize, counteract |
| antagonism | (noun) (biochemistry) interference in or inhibition of the physiological action of a chemical substance by another having a similar structure | - |
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| (noun) an actively expressed feeling of dislike and hostility | - |
| (noun) the relation between opposing principles or forces or factors | - |
| (noun) a state of deep-seated ill-will | Synonyms: enmity, hostility |
| antagonist | (noun) a drug that neutralizes or counteracts the effects of another drug | - |
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| (noun) a muscle that relaxes while another contracts | - |
| (noun) someone who offers opposition | Synonyms: adversary, opponent, opposer, resister |
| antagonistic | (adjective) arousing animosity or hostility | - |
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| (adjective) used especially of drugs or muscles that counteract or neutralize each other's effect | Synonyms: incompatible |
| (adjective) characterized by antagonism or antipathy | Synonyms: antipathetic, antipathetical |
| (adjective) incapable of harmonious association | - |
| (adjective) indicating opposition or resistance | Synonyms: counter |
| antagonistically | (adverb) in an antagonistic manner | - |
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| antagonize | (verb) provoke the hostility of | Synonyms: antagonise |
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| (verb) act in opposition to | Synonyms: antagonise, counteract |
| antapex | (noun) the point opposite in direction from the solar apex; the point the solar system is moving away from | - |
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| antbird | (noun) any of various dull-colored South American birds that feeding on ants some following army ant swarms | Synonyms: ant bird |
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| ante | (noun) (poker) the initial contribution that each player makes to the pot | - |
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| (verb) place one's stake | - |
| anteater | (noun) any of several tropical American mammals of the family Myrmecophagidae which lack teeth and feed on ants and termites | Synonyms: New World anteater |
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| (noun) nocturnal burrowing mammal of the grasslands of Africa that feeds on termites; sole extant representative of the order Tubulidentata | Synonyms: aardvark, ant bear, Orycteropus afer |
| (noun) a burrowing monotreme mammal covered with spines and having a long snout and claws for hunting ants and termites; native to Australia | Synonyms: echidna, spiny anteater |
| (noun) a burrowing monotreme mammal covered with spines and having a long snout and claws for hunting ants and termites; native to New Guinea | Synonyms: echidna, spiny anteater |
| (noun) toothless mammal of southern Africa and Asia having a body covered with horny scales and a long snout for feeding on ants and termites | Synonyms: pangolin, scaly anteater |
| (noun) small Australian marsupial having long snout and strong claws for feeding on termites; nearly extinct | Synonyms: banded anteater, Myrmecobius fasciatus, numbat |
| antebellum | (adjective) belonging to a period before a war especially the American Civil War | - |
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| antecede | (verb) be earlier in time; go back further | Synonyms: antedate, forego, forgo, precede, predate |
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| antecedence | (noun) preceding in time | Synonyms: antecedency, anteriority, precedence, precedency, priority |
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| antecedency | (noun) preceding in time | Synonyms: antecedence, anteriority, precedence, precedency, priority |
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| antecedent | (adjective) preceding in time or order | - |
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| (noun) the referent of an anaphor; a phrase or clause that is referred to by an anaphoric pronoun | - |
| (noun) a preceding occurrence or cause or event | - |
| (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: ancestor, ascendant, ascendent, root |
| (noun) anything that precedes something similar in time | Synonyms: forerunner |
| antecedently | (adverb) at an earlier time or formerly | Synonyms: previously |
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| antechamber | (noun) a large entrance or reception room or area | Synonyms: anteroom, entrance hall, foyer, hall, lobby, vestibule |
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| antecubital | (adjective) of or relating to the region of the arm in front of the elbow | - |
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| antedate | (verb) establish something as being earlier relative to something else | Synonyms: foredate, predate |
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| (verb) be earlier in time; go back further | Synonyms: antecede, forego, forgo, precede, predate |
| 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 |
| antefix | (noun) carved ornament at the eaves of a tile roof concealing the joints between tiles | - |
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| antelope | (noun) graceful Old World ruminant with long legs and horns directed upward and backward; includes gazelles, springboks, impalas, addax, gerenuks, blackbucks, dik-diks | - |
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| antemeridian | (adjective) before noon | - |
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| antemortem | (adjective) preceding death | - |
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| antenatal | (adjective) occurring or existing before birth | Synonyms: antepartum, prenatal |
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| antenna | (noun) one of a pair of mobile appendages on the head of e.g. insects and crustaceans; typically sensitive to touch and taste | Synonyms: feeler |
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| (noun) an electrical device that sends or receives radio or television signals | Synonyms: aerial, transmitting aerial |
| (noun) sensitivity similar to that of a receptor organ | Synonyms: feeler |
| antennal | (adjective) of or relating to antennae | Synonyms: antennary |
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| antennary | (adjective) of or relating to antennae | Synonyms: antennal |
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| antenuptial | (adjective) relating to events before a marriage | Synonyms: premarital, prenuptial |
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| antepartum | (adjective) occurring or existing before birth | Synonyms: antenatal, prenatal |
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| antepenult | (noun) the 3rd syllable of a word counting back from the end | Synonyms: antepenultima, antepenultimate |
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| antepenultima | (noun) the 3rd syllable of a word counting back from the end | Synonyms: antepenult, antepenultimate |
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| antepenultimate | (adjective) third from last | - |
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| (noun) the 3rd syllable of a word counting back from the end | Synonyms: antepenult, antepenultima |
| anterior | (adjective) of or near the head end or toward the front plane of a body | - |
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| (adjective) earlier in time | Synonyms: prior |
| (noun) a tooth situated at the front of the mouth | Synonyms: front tooth |
| anteriority | (noun) the quality of being in front or (in lower animals) toward the head | - |
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| (noun) preceding in time | Synonyms: antecedence, antecedency, precedence, precedency, priority |
| anteriorly | (adverb) in an anterior direction | - |
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| anterograde | (adjective) of amnesia; affecting time immediately following trauma | - |
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| anteroom | (noun) a large entrance or reception room or area | Synonyms: antechamber, entrance hall, foyer, hall, lobby, vestibule |
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| anthelminthic | (adjective) capable of expelling or destroying parasitic worms | Synonyms: anthelmintic, helminthic, parasiticidal |
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| (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelmintic, helminthic, vermifuge |
| anthelmintic | (adjective) capable of expelling or destroying parasitic worms | Synonyms: anthelminthic, helminthic, parasiticidal |
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| (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelminthic, helminthic, vermifuge |
| anthem | (noun) a song of praise (to God or to a saint or to a nation) | Synonyms: hymn |
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| (noun) a song of devotion or loyalty (as to a nation or school) | - |
| anther | (noun) the part of the stamen that contains pollen; usually borne on a stalk | - |
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| antheral | (adjective) capable of fertilizing female organs | Synonyms: staminate |
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| antheridial | (adjective) relating to or characterized by an antheridium | - |
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| antheridiophore | (noun) gametophore bearing antheridia as in certain mosses and liverworts | - |
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| antheridium | (noun) the male sex organ of spore-producing plants; produces antherozoids; equivalent to the anther in flowers | - |
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