| allochthonous | (adjective) of rocks, deposits, etc.; found in a place other than where they and their constituents were formed | - |
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| allocution | (noun) (rhetoric) a formal or authoritative address that advises or exhorts | - |
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| allogeneic | (adjective) denoting or relating to cells or tissues from individuals belonging to the same species but genetically dissimilar (and hence immunologically incompatible) | - |
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| allographic | (adjective) of or relating to an allograph | - |
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| allometric | (adjective) relating to or marked by allometry | - |
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| allomorphic | (adjective) pertaining to allomorphs | - |
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| allopathic | (adjective) of or relating to the practice of allopathy | - |
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| allopatric | (adjective) (of biological species or speciation) occurring in areas isolated geographically from one another | - |
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| allophonic | (adjective) pertaining to allophones | - |
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| allotropic | (adjective) of or related to or exhibiting allotropism | Synonyms: allotropical |
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| allotropical | (adjective) of or related to or exhibiting allotropism | Synonyms: allotropic |
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| allowance | (noun) the act of allowing | - |
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| (noun) a permissible difference; allowing some freedom to move within limits | Synonyms: leeway, margin, tolerance |
| (noun) an amount allowed or granted (as during a given period) | - |
| (noun) an amount added or deducted on the basis of qualifying circumstances | Synonyms: adjustment |
| (noun) a sum granted as reimbursement for expenses | - |
| (noun) a reserve fund created by a charge against profits in order to provide for changes in the value of a company's assets | Synonyms: allowance account, valuation account, valuation reserve |
| (verb) put on a fixed allowance, as of food | - |
| allspice | (noun) ground dried berrylike fruit of a West Indian allspice tree; suggesting combined flavors of cinnamon and nutmeg and cloves | - |
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| (noun) aromatic West Indian tree that produces allspice berries | Synonyms: allspice tree, Pimenta dioica, pimento tree |
| (noun) deciduous shrubs having aromatic bark; eastern China; southwestern and eastern United States | - |
| allylic | (adjective) of or pertaining to the allyl radical | - |
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| almanac | (noun) an annual publication containing tabular information in a particular field or fields arranged according to the calendar of a given year | - |
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| (noun) an annual publication including weather forecasts and other miscellaneous information arranged according to the calendar of a given year | Synonyms: farmer's calendar |
| alocasia | (noun) any plant of the genus Alocasia having large showy basal leaves and boat-shaped spathe and reddish berries | Synonyms: elephant's ear, elephant ear |
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| alopecia | (noun) loss of hair (especially on the head) or loss of wool or feathers; in humans it can result from heredity or hormonal imbalance or certain diseases or drugs and treatments (chemotherapy for cancer) | - |
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| alopecic | (adjective) pertaining to loss of hair or wool or feathers | - |
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| alpaca | (noun) domesticated llama with long silky fleece; believed to be a domesticated variety of the guanaco | Synonyms: Lama pacos |
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| (noun) a thin glossy fabric made of the wool of the Lama pacos, or made of a rayon or cotton imitation of that wool | - |
| (noun) wool of the alpaca | - |
| alpenstock | (noun) a stout staff with a metal point; used by mountain climbers | - |
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| alphabetic | (adjective) arranged in order according to the alphabet | Synonyms: alphabetical |
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| (adjective) relating to or expressed by a writing system that uses an alphabet | Synonyms: alphabetical |
| alphabetical | (adjective) arranged in order according to the alphabet | Synonyms: alphabetic |
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| (adjective) relating to or expressed by a writing system that uses an alphabet | Synonyms: alphabetic |
| alphabetically | (adverb) in alphabetical order | - |
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| alphameric | (adjective) of or pertaining to alphanumeric characters | Synonyms: alphamerical, alphanumeric, alphanumerical |
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| alphamerical | (adjective) of or pertaining to alphanumeric characters | Synonyms: alphameric, alphanumeric, alphanumerical |
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| alphanumeric | (adjective) of or pertaining to alphanumeric characters | Synonyms: alphameric, alphamerical, alphanumerical |
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| alphanumerical | (adjective) of or pertaining to alphanumeric characters | Synonyms: alphameric, alphamerical, alphanumeric |
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| alphanumerics | (noun) a character set that includes letters and digits and punctuation | Synonyms: alphanumeric characters |
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| altarpiece | (noun) a painted or carved screen placed above and behind an altar or communion table | Synonyms: reredos |
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| altcoin | (noun) an alternative cryptocurrency | - |
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| altercate | (verb) have a disagreement over something | Synonyms: argufy, dispute, quarrel, scrap |
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| altercation | (noun) noisy quarrel | Synonyms: affray, fracas |
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| altocumulus | (noun) a cumulus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altocumulus cloud |
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| altricial | (adjective) (of hatchlings) naked and blind and dependent on parents for food | - |
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| altruistic | (adjective) showing unselfish concern for the welfare of others | Synonyms: selfless |
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| altruistically | (adverb) in an altruistic manner | Synonyms: selflessly |
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| amaurotic | (adjective) pertaining to blindness caused by amaurosis | - |
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| amberjack | (noun) any of several amber to coppery fork-tailed warm-water carangid fishes | Synonyms: amberfish |
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| ambiance | (noun) the atmosphere of an environment | Synonyms: ambience |
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| (noun) a particular environment or surrounding influence | Synonyms: ambience, atmosphere |
| ambience | (noun) the atmosphere of an environment | Synonyms: ambiance |
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| (noun) a particular environment or surrounding influence | Synonyms: ambiance, atmosphere |
| ambivalence | (noun) mixed feelings or emotions | Synonyms: ambivalency |
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| ambivalency | (noun) mixed feelings or emotions | Synonyms: ambivalence |
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| amblyopic | (adjective) pertaining to a kind of visual impairment without apparent organic pathology | - |
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| amboceptor | (noun) an immune body formed in the blood during infection or immunization that serves to link the complement to the antigen. | - |
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| ambulacral | (adjective) pertaining to the ambulacra of radial echinoderms | - |
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| ambulacrum | (noun) one of the five areas on the undersurface of an echinoderm on which the tube feet are located | - |
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| ambulance | (noun) a vehicle that takes people to and from hospitals | - |
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| ambuscade | (noun) the act of concealing yourself and lying in wait to attack by surprise | Synonyms: ambush, lying in wait, trap |
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| (verb) wait in hiding to attack | Synonyms: ambush, bushwhack, lie in wait, lurk, scupper, waylay |
| amebic | (adjective) pertaining to or resembling amoebae | Synonyms: ameban, amebous, amoeban, amoebic, amoebous |
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| amenorrheic | (adjective) related to the suppression of normal menstrual flow for any reason other than pregnancy | Synonyms: amenorrheal, amenorrhoeal, amenorrhoeic |
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| amenorrhoeic | (adjective) related to the suppression of normal menstrual flow for any reason other than pregnancy | Synonyms: amenorrheal, amenorrheic, amenorrhoeal |
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| amentaceous | (adjective) (of plants) bearing or characterized by aments or catkins | Synonyms: amentiferous |
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| amerce | (verb) punish with an arbitrary penalty | - |
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| (verb) punish by a fine imposed arbitrarily by the discretion of the court | - |
| amercement | (noun) money extracted as a penalty | Synonyms: fine, mulct |
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| amerciable | (adjective) of a crime or misdemeanor; punishable by a fine set by a judge | - |
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| americium | (noun) a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms | Synonyms: Am, atomic number 95 |
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| ametabolic | (adjective) undergoing slight or no metamorphosis | Synonyms: ametabolous |
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| (adjective) undergoing no (or only slight) metamorphosis | - |
| ametropic | (adjective) of or relating to an abnormal condition of the eye in which visual images are not in focus on the retina | - |
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| amicability | (noun) having a disposition characterized by warmth and friendliness | Synonyms: amicableness |
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| (noun) a disinclination to quarrel | Synonyms: amicableness |
| amicable | (adjective) characterized by friendship and good will | - |
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| amicableness | (noun) having a disposition characterized by warmth and friendliness | Synonyms: amicability |
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| (noun) a disinclination to quarrel | Synonyms: amicability |
| amicably | (adverb) in an amicable manner | - |
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| aminic | (adjective) pertaining to or containing any of a group of organic compounds of nitrogen derived from ammonia | Synonyms: amino |
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| aminoaciduria | (noun) abnormal presence of amino acids in the urine; usually a symptom of metabolic defects | - |
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| amitotic | (adjective) pertaining to a simple method of cell division | - |
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| ammoniac | (adjective) pertaining to or containing or similar to ammonia | Synonyms: ammoniacal |
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| (noun) the aromatic gum of the ammoniac plant | Synonyms: gum ammoniac |
| ammoniacal | (adjective) pertaining to or containing or similar to ammonia | Synonyms: ammoniac |
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| ammonification | (noun) impregnation with ammonia or a compound of ammonia | - |
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| ammonitic | (adjective) of or related to an order of fossil cephalopods | - |
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| amnesiac | (adjective) suffering from a partial loss of memory | Synonyms: amnesic |
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| (noun) a person suffering from amnesia | Synonyms: amnesic |
| amnesic | (adjective) of or relating to or caused by amnesia | Synonyms: amnestic |
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| (adjective) suffering from a partial loss of memory | Synonyms: amnesiac |
| (noun) a person suffering from amnesia | Synonyms: amnesiac |
| amnestic | (adjective) of or relating to or caused by amnesia | Synonyms: amnesic |
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| amnic | (adjective) of or related to the amnion or characterized by developing an amnion | Synonyms: amnionic, amniotic |
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| amniocentesis | (noun) (pregnancy) extraction by centesis of amniotic fluid from a pregnant woman (after the 15th week of pregnancy) to aid in the diagnosis of fetal abnormalities | Synonyms: amnio |
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| amnionic | (adjective) of or related to the amnion or characterized by developing an amnion | Synonyms: amnic, amniotic |
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| amniotic | (adjective) of or related to the amnion or characterized by developing an amnion | Synonyms: amnic, amnionic |
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| amoebic | (adjective) pertaining to or resembling amoebae | Synonyms: ameban, amebic, amebous, amoeban, amoebous |
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| amoristic | (adjective) of or pertaining to romantic love | - |
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| amoxicillin | (noun) an antibiotic; a semisynthetic oral penicillin (trade names Amoxil and Larotid and Polymox and Trimox and Augmentin) used to treat bacterial infections | Synonyms: Amoxil, Augmentin, Larotid, Polymox, Trimox |
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| amphibiotic | (adjective) having an aquatic early or larval form and a terrestrial adult form | Synonyms: semiaquatic |
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| amphibrach | (noun) a metrical unit with unstressed-stressed-unstressed syllables (e.g., `remember') | - |
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| amphictyony | (noun) an association of neighboring states or tribes in ancient Greece; established originally to defend a common religious center | - |
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| amphiprotic | (adjective) having characteristics of both an acid and a base and capable of reacting as either | Synonyms: amphoteric |
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| amphitheatric | (adjective) of or related to an amphitheater | Synonyms: amphitheatrical |
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| amphitheatrical | (adjective) of or related to an amphitheater | Synonyms: amphitheatric |
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| amphoric | (adjective) the sound heard in auscultation resembling the hollow sound made by blowing across the mouth of a bottle | - |
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| amphoteric | (adjective) having characteristics of both an acid and a base and capable of reacting as either | Synonyms: amphiprotic |
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| amphotericin | (noun) an antibiotic and antifungal agent | - |
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| ampicillin | (noun) semisynthetic penicillin (trade names Principen and Polycillin and SK-Ampicillin) | Synonyms: Polycillin, Principen, SK-Ampicillin |
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| amplification | (noun) (electronics) the act of increasing voltage or power or current | - |
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| (noun) addition of extra material or illustration or clarifying detail | Synonyms: elaboration |
| (noun) the amount of increase in signal power or voltage or current expressed as the ratio of output to input | Synonyms: gain |
| amuck | (adjective) wildly frenzied and out of control | Synonyms: amok, berserk |
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| (adverb) in a murderous frenzy | Synonyms: amok, murderously |
| (adverb) wildly; without self-control | Synonyms: amok |
| amylaceous | (adjective) resembling starch | Synonyms: amyloid, amyloidal, farinaceous, starchlike |
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| amylolytic | (adjective) of or related to the process of amylolysis | - |
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| anabatic | (adjective) of an air current or wind; rising especially up a slope | - |
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| anabiotic | (adjective) of or related to the state of anabiosis | - |
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| anabolic | (adjective) characterized by or promoting constructive metabolism | - |
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| (adjective) of or related to the synthetic phase of metabolism | - |
| anachronic | (adjective) chronologically misplaced | Synonyms: anachronistic, anachronous |
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| anachronism | (noun) an artifact that belongs to another time | - |
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| (noun) a person who seems to be displaced in time; who belongs to another age | - |
| (noun) something located at a time when it could not have existed or occurred | Synonyms: misdating, mistiming |
| anachronistic | (adjective) chronologically misplaced | Synonyms: anachronic, anachronous |
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| anachronistically | (adverb) in an anachronistic manner | - |
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