| archaic | (adjective) little evolved from or characteristic of an earlier ancestral type | Synonyms: primitive |
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| (adjective) so extremely old as seeming to belong to an earlier period | Synonyms: antediluvian, antiquated |
| archaistic | (adjective) imitative of an archaic style or manner | - |
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| archangelic | (adjective) of or relating to or resembling archangels | Synonyms: archangelical |
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| archbishopric | (noun) the territorial jurisdiction of an archbishop | - |
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| archeologic | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeologic, archaeological, archeological |
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| archeozoic | (adjective) of or belonging to earlier of two divisions of the Precambrian era | Synonyms: archaeozoic |
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| archipelagic | (adjective) relating to or part of an archipelago | - |
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| architectonic | (adjective) of or pertaining to construction or architecture | Synonyms: tectonic |
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| arctic | (adjective) extremely cold | Synonyms: frigid, gelid, glacial, icy, polar |
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| (noun) a waterproof overshoe that protects shoes from water or snow | Synonyms: galosh, golosh, gumshoe, rubber |
| argentic | (adjective) relating to compounds in which silver is bivalent | - |
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| aristocratic | (adjective) belonging to or characteristic of the nobility or aristocracy | Synonyms: aristocratical, blue-blooded, blue, gentle, patrician |
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| arithmetic | (adjective) relating to or involving arithmetic | Synonyms: arithmetical |
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| (noun) the branch of pure mathematics dealing with the theory of numerical calculations | - |
| aromatic | (adjective) (chemistry) of or relating to or containing one or more benzene rings | - |
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| (adjective) having a strong pleasant odor | Synonyms: redolent |
| arrhythmic | (adjective) without regard for rhythm | Synonyms: arrhythmical |
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| (adjective) lacking a steady rhythm | Synonyms: jerking, jerky |
| arsenic | (noun) a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and in various alloys; found in arsenopyrite and orpiment and realgar | Synonyms: As, atomic number 33 |
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| (noun) a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer | Synonyms: arsenic trioxide, arsenous anhydride, arsenous oxide, ratsbane, white arsenic |
| arteriosclerotic | (adjective) affected by arteriosclerosis | - |
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| arthralgic | (adjective) of or relating to arthralgia | - |
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| arthritic | (adjective) of or pertaining to arthritis | Synonyms: creaky, rheumatic, rheumatoid, rheumy |
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| (noun) a person afflicted with arthritis | - |
| arthromeric | (adjective) of or relating to one of the body segments of jointed animals | - |
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| arthrosporic | (adjective) of or relating to arthrospores | Synonyms: arthrosporous |
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| artistic | (adjective) relating to or characteristic of art or artists | - |
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| (adjective) satisfying aesthetic standards and sensibilities | - |
| (adjective) aesthetically pleasing | Synonyms: aesthetic, esthetic |
| ascetic | (adjective) pertaining to or characteristic of an ascetic or the practice of rigorous self-discipline | Synonyms: ascetical |
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| (adjective) practicing great self-denial | Synonyms: ascetical, austere, spartan |
| (noun) someone who practices self denial as a spiritual discipline | Synonyms: abstainer |
| ascitic | (adjective) of or relating to or resulting from an abnormal accumulation of protein and electrolyte rich fluid in the peritoneal cavity | - |
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| ascosporic | (adjective) of or relating to ascospores | Synonyms: ascosporous |
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| asdic | (noun) a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return | Synonyms: echo sounder, sonar |
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| aseptic | (adjective) free of or using methods to keep free of pathological microorganisms | Synonyms: sterile |
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| asphaltic | (adjective) containing asphalt | - |
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| aspheric | (adjective) varying slightly from a perfectly spherical shape | Synonyms: aspherical |
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| aspic | (noun) savory jelly based on fish or meat stock used as a mold for meats or vegetables | - |
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| astatic | (adjective) not static or stable | - |
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| asthenic | (adjective) having a slender physique | - |
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| (adjective) lacking energy or vitality | Synonyms: adynamic, debilitated, enervated |
| asthmatic | (adjective) relating to breathing with a whistling sound | Synonyms: wheezing, wheezy |
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| (noun) a person suffering from asthma | - |
| astigmatic | (adjective) of or relating to a defect in the eye or in a lens caused by a deviation from spherical curvature which prevents light rays from meeting at a common focus and so results in distorted images | - |
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| astrocytic | (adjective) of or relating to or containing large star-shaped cells in the neuroglia | - |
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| astronautic | (adjective) of or belonging to astronauts or the science of astronautics | Synonyms: astronautical |
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| astronomic | (adjective) relating or belonging to the science of astronomy | Synonyms: astronomical |
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| (adjective) inconceivably large | Synonyms: astronomical, galactic |
| asymmetric | (adjective) characterized by asymmetry in the spatial arrangement or placement of parts or components | Synonyms: asymmetrical |
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| asymptomatic | (adjective) having no symptoms of illness or disease | Synonyms: symptomless |
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| asymptotic | (adjective) relating to or of the nature of an asymptote | - |
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| asyndetic | (adjective) lacking conjunctions | - |
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| asynergic | (adjective) of or relating to the state of asynergy; lacking synergy | - |
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| atactic | (adjective) lacking motor coordination; marked or caused by ataxia | Synonyms: ataxic |
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| ataractic | (adjective) tending to soothe or tranquilize | Synonyms: ataraxic, sedative, tranquilising, tranquilizing, tranquillising, tranquillizing |
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| (noun) a drug used to reduce stress or tension without reducing mental clarity | Synonyms: antianxiety agent, ataractic agent, ataractic drug, tranquilizer, tranquilliser, tranquillizer |
| ataraxic | (adjective) tending to soothe or tranquilize | Synonyms: ataractic, sedative, tranquilising, tranquilizing, tranquillising, tranquillizing |
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| atavistic | (adjective) characteristic of an atavist | Synonyms: throwback |
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| ataxic | (adjective) lacking motor coordination; marked or caused by ataxia | Synonyms: atactic |
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| ateleiotic | (adjective) of or relating to ateleiosis | - |
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| atheistic | (adjective) related to or characterized by or given to atheism | Synonyms: atheist, atheistical |
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| (adjective) rejecting any belief in gods | Synonyms: atheistical, unbelieving |
| atheromatic | (adjective) of or relating to or resembling atheroma | Synonyms: atheromatous |
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| atherosclerotic | (adjective) of or relating to atherosclerosis | - |
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| athletic | (adjective) relating to or befitting athletics or athletes | - |
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| (adjective) vigorously active | Synonyms: acrobatic, gymnastic |
| (adjective) having a sturdy and well proportioned body | - |
| atmospheric | (adjective) relating to or located in the atmosphere | Synonyms: atmospherical |
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| atomic | (adjective) (weapons) deriving destructive energy from the release of atomic energy | Synonyms: nuclear |
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| (adjective) of or relating to or comprising atoms | - |
| (adjective) immeasurably small | - |
| atomistic | (adjective) divided into separate and often disparate elements | Synonyms: atomistical |
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| atonalistic | (adjective) of or relating to atonalism | - |
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| atonic | (adjective) (used of syllables) carrying no stress | Synonyms: unaccented |
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| (adjective) characterized by a lack of tonus | - |
| atoxic | (adjective) not producing or resulting from poison | Synonyms: nontoxic |
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| atrophic | (adjective) relating to or characterized by atrophy | - |
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| attic | (noun) floor consisting of open space at the top of a house just below roof; often used for storage | Synonyms: garret, loft |
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| (noun) (architecture) a low wall at the top of the entablature; hides the roof | - |
| (noun) informal terms for a human head | Synonyms: bean, bonce, dome, noggin, noodle |
| atypic | (adjective) not representative of a group, class, or type | Synonyms: atypical, untypical |
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| audiometric | (adjective) of or relating to audiometry | - |
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| augitic | (adjective) of or relating to or containing the mineral augite | - |
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| auric | (adjective) of or relating to or containing or derived from gold | Synonyms: aurous |
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| austenitic | (adjective) composed of austenite | - |
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| autarchic | (adjective) of or relating to or characterized by autarchy | Synonyms: autarchical, autarkical |
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| autarkic | (adjective) of countries; not relying on imports | Synonyms: autarkical |
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| authentic | (adjective) not counterfeit or copied | Synonyms: bona fide, unquestionable, veritable |
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| (adjective) conforming to fact and therefore worthy of belief | Synonyms: reliable |
| autistic | (adjective) characteristic of or affected with autism | - |
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| autobiographic | (adjective) relating to or in the style of an autobiography | Synonyms: autobiographical |
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| (adjective) of or relating to or characteristic of an autobiographer | Synonyms: autobiographical |
| autocatalytic | (adjective) relating to or proceeding by autocatalysis | - |
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| autochthonic | (adjective) originating where it is found | Synonyms: autochthonal, autochthonous, endemic, indigenous |
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| autocratic | (adjective) offensively self-assured or given to exercising usually unwarranted power | Synonyms: bossy, dominating, high-and-mighty, magisterial, peremptory |
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| (adjective) characteristic of an absolute ruler or absolute rule; having absolute sovereignty | Synonyms: authoritarian, despotic, dictatorial, tyrannic, tyrannical |
| autodidactic | (adjective) relating to or having the characteristics of an autodidact | - |
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| autoerotic | (adjective) sexually satisfying yourself (as by masturbation) | - |
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| autogamic | (adjective) characterized by or fit for autogamy | Synonyms: autogamous |
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| autogenetic | (adjective) of or relating to autogenesis | - |
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| autogenic | (adjective) originating within the body | Synonyms: autogenous |
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| autographic | (adjective) written in the author's own handwriting | - |
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| autolytic | (adjective) of or relating to self-digestion | - |
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| automatic | (adjective) operating with minimal human intervention; independent of external control | - |
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| (adjective) without volition or conscious control | Synonyms: reflex, reflexive |
| (adjective) resembling the unthinking functioning of a machine | Synonyms: automatonlike, machinelike, robotic, robotlike |
| (noun) self-loading rifle capable of automatic fire | Synonyms: automatic rifle, machine rifle |
| (noun) a pistol that will keep firing until the ammunition is gone or the trigger is released | Synonyms: automatic pistol |
| autonomic | (adjective) relating to or controlled by the autonomic nervous system | - |
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| autophytic | (adjective) of or relating to organisms (as green plants) that can make complex organic nutritive compounds from simple inorganic sources by photosynthesis | Synonyms: autotrophic |
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| autoplastic | (adjective) of or relating to or involved in autoplasty | - |
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| autoradiographic | (adjective) of or relating to or produced by autoradiography | - |
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| autosemantic | (adjective) of a word or phrase meaningful in isolation, independent of context | - |
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| autotelic | (adjective) of or relating to or believing in autotelism | - |
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| autotomic | (adjective) of or relating to autotomy | - |
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| autotrophic | (adjective) of or relating to organisms (as green plants) that can make complex organic nutritive compounds from simple inorganic sources by photosynthesis | Synonyms: autophytic |
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| autotypic | (adjective) of or relating to autotypy | - |
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| auxetic | (adjective) of or relating to growth by auxesis | - |
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| auxinic | (adjective) relating to or containing auxins | - |
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| avifaunistic | (adjective) of or relating to birds of a particular region or period | Synonyms: avifaunal |
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| avionic | (adjective) of or relating to avionics | - |
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| avitaminotic | (adjective) of or relating to or characteristic of avitaminosis | - |
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| axenic | (adjective) (of experimental animals) raised under sterile conditions | - |
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| (adjective) (used of cultures of microorganisms) completely free from other organisms | - |
| axiomatic | (adjective) of or relating to or derived from axioms | Synonyms: axiomatical, postulational |
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| (adjective) containing aphorisms or maxims | Synonyms: aphoristic |
| (adjective) evident without proof or argument | Synonyms: self-evident, taken for granted |
| azoic | (adjective) before the appearance of life | - |
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| azonic | (adjective) not restricted to any particular zone or region | - |
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| azotemic | (adjective) of or involving excess nitrogenous waste products in the urine (usually due to kidney insufficiency) | Synonyms: uraemic, uremic |
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| azotic | (adjective) of or containing nitrogen | Synonyms: nitric, nitrous |
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