| abetter | (noun) one who helps or encourages or incites another | Synonyms: abettor |
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| abstracter | (noun) one who makes abstracts or summarizes information | Synonyms: abstractor |
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| abutter | (noun) the owner of contiguous property | - |
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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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| accelerometer | (noun) an instrument for measuring the acceleration of aircraft or rockets | - |
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| accouterment | (noun) clothing that is worn or carried, but not part of your main clothing | Synonyms: accessory, accoutrement |
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| actinometer | (noun) an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect) | - |
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| adapter | (noun) device that enables something to be used in a way different from that for which it was intended or makes different pieces of apparatus compatible | Synonyms: adaptor |
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| (noun) a musician who adapts a composition for particular voices or instruments or for another style of performance | Synonyms: arranger, transcriber |
| adjuster | (noun) one who investigates insurance claims or claims for damages and recommends an effective settlement | Synonyms: adjustor, claim agent, claims adjuster, claims adjustor |
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| adopter | (noun) a person who adopts a child of other parents as his or her own child | Synonyms: adoptive parent |
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| adrenosterone | (noun) a steroid having androgenic activity; obtained from the cortex of the adrenal gland | - |
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| adulterant | (noun) any substance that lessens the purity or effectiveness of a substance | Synonyms: adulterator |
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| adulteration | (noun) the act of adulterating (especially the illicit substitution of one substance for another) | - |
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| (noun) being mixed with extraneous material; the product of adulterating | Synonyms: debasement |
| adulterator | (noun) a changer who lessens the purity or effectiveness of a substance | - |
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| (noun) any substance that lessens the purity or effectiveness of a substance | Synonyms: adulterant |
| adulterer | (noun) someone who commits adultery or fornication | Synonyms: fornicator |
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| adulteress | (noun) a woman adulterer | Synonyms: fornicatress, hussy, jade, loose woman, slut, strumpet, trollop |
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| adulterousness | (noun) The quality of being adulterous, involving sexual intercourse by a married person with someone other than their spouse. | - |
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| adultery | (noun) extramarital sex that willfully and maliciously interferes with marriage relations | Synonyms: criminal conversation, fornication |
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| afterbirth | (noun) the placenta and fetal membranes that are expelled from the uterus after the baby is born | - |
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| afterburner | (noun) a device that injects fuel into a hot exhaust for extra thrust | - |
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| aftercare | (noun) care and treatment of a convalescent patient | - |
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| afterdamp | (noun) a toxic mixture of gases (including carbon dioxide and carbon monoxide and nitrogen) after an explosion of firedamp in a mine | - |
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| afterdeck | (noun) a deck abaft of midships | - |
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| aftereffect | (noun) any result that follows its cause after an interval | - |
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| (noun) a delayed effect of a drug or therapy | - |
| afterglow | (noun) the pleasure of remembering some pleasant event | - |
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| (noun) a glow sometimes seen in the sky after sunset | - |
| afterimage | (noun) an image (usually a negative image) that persists after stimulation has ceased | Synonyms: aftersensation |
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| afterlife | (noun) life after death | Synonyms: hereafter |
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| aftermath | (noun) the outcome of an event especially as relative to an individual | Synonyms: consequence |
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| (noun) the consequences of an event (especially a catastrophic event) | Synonyms: backwash, wake |
| afternoon | (noun) a conventional expression of greeting or farewell, used to wish someone a good afternoon | Synonyms: good afternoon |
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| (noun) the part of the day between noon and evening | - |
| afterpains | (noun) pains felt by a woman after her baby is born; associated with contractions of the uterus | - |
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| afterpiece | (noun) a brief dramatic piece (usually comic) presented after a play | - |
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| afters | (noun) a dish served as the last course of a meal | Synonyms: dessert, sweet |
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| aftersensation | (noun) an image (usually a negative image) that persists after stimulation has ceased | Synonyms: afterimage |
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| aftershaft | (noun) a supplementary feather (usually small) on the underside of the base of the shaft of some feathers in some birds | - |
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| aftershock | (noun) a tremor (or one of a series of tremors) occurring after the main shock of an earthquake | - |
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| aftertaste | (noun) an afterimage of a taste | - |
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| afterthought | (noun) an addition that was not included in the original plan | - |
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| (noun) thinking again about a choice previously made | Synonyms: reconsideration, rethink, second thought |
| afterworld | (noun) the place where you are after you die | - |
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| alabaster | (noun) a very light white | - |
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| (noun) a compact fine-textured, usually white gypsum used for carving | - |
| (noun) a hard compact kind of calcite | Synonyms: Mexican onyx, onyx marble, oriental alabaster |
| albuterol | (noun) a bronchodilator (trade names Ventolin or Proventil) used for asthma and emphysema and other lung conditions; available in oral or inhalant forms; side effects are tachycardia and shakiness | Synonyms: Proventil, Ventolin |
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| aldosterone | (noun) a corticosteroid hormone that is secreted by the cortex of the adrenal gland; regulates salt (sodium and potassium) and water balance | - |
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| aldosteronism | (noun) a condition caused by overproduction of aldosterone | Synonyms: hyperaldosteronism |
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| algometer | (noun) device for measuring pain caused by pressure | - |
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| aliterate | (noun) a person who can read but is disinclined to derive information from literary sources | Synonyms: aliterate person |
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| alliteration | (noun) use of the same consonant at the beginning of each stressed syllable in a line of verse | Synonyms: beginning rhyme, head rhyme, initial rhyme |
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| alliterator | (noun) a speaker or writer who makes use of alliteration | - |
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| alterability | (noun) the quality of being alterable | - |
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| alteration | (noun) the act of revising or altering (involving reconsideration and modification) | Synonyms: revision |
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| (noun) the act of making something different (as e.g. the size of a garment) | Synonyms: adjustment, modification |
| (noun) an event that occurs when something passes from one state or phase to another | Synonyms: change, modification |
| altercation | (noun) noisy quarrel | Synonyms: affray, fracas |
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| altering | (noun) the sterilization of an animal | Synonyms: fixing, neutering |
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| alternate | (noun) someone who takes the place of another person | Synonyms: replacement, surrogate |
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| alternation | (noun) successive change from one thing or state to another and back again | - |
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| alternative | (noun) one of a number of things from which only one can be chosen | Synonyms: choice, option |
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| alternator | (noun) an old term for an electric generator that produces alternating current (especially in automobiles) | - |
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| altimeter | (noun) an instrument that measures the height above ground; used in navigation | - |
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| ambidexterity | (noun) the property of being equally skillful with each hand | Synonyms: ambidextrousness |
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| amethopterin | (noun) toxic antimetabolite that limits cellular reproduction by acting as an antagonist to folic acid; used to treat certain cancers and psoriasis and rheumatoid arthritis | Synonyms: methotrexate, methotrexate sodium |
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| ammeter | (noun) a meter that measures the flow of electrical current in amperes | - |
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| amphitheater | (noun) an oval large stadium with tiers of seats; an arena in which contests and spectacles are held | Synonyms: amphitheatre, coliseum |
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| (noun) a sloping gallery with seats for spectators (as in an operating room or theater) | Synonyms: amphitheatre |
| amphotericin | (noun) an antibiotic and antifungal agent | - |
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| androsterone | (noun) an androgenic hormone that is less active than testosterone | - |
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| anemoclinometer | (noun) A type of instrument which measures the inclination of the wind to the horizontal plane. | - |
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| anemometer | (noun) a gauge for recording the speed and direction of wind | Synonyms: wind gage, wind gauge |
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| angiopteris | (noun) highly variable species of very large primitive ferns of the Pacific tropical areas with high rainfall | Synonyms: Angiopteris evecta, giant fern |
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| anointer | (noun) one who anoints as a religious ceremony | - |
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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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| 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 |
| anterior | (noun) a tooth situated at the front of the mouth | Synonyms: front tooth |
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| 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 |
| anteroom | (noun) a large entrance or reception room or area | Synonyms: antechamber, entrance hall, foyer, hall, lobby, vestibule |
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| antibacterial | (noun) any drug that destroys bacteria or inhibits their growth | Synonyms: antibacterial drug, bactericide |
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| anticholinesterase | (noun) a medicine that inhibits cholinesterase by combining with it and so has a cholinergic effect | - |
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| antimatter | (noun) matter consisting of elementary particles that are the antiparticles of those making up normal substances | - |
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| apteryx | (noun) nocturnal flightless bird of New Zealand having a long neck and stout legs; only surviving representative of the order Apterygiformes | Synonyms: kiwi |
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| arbiter | (noun) someone chosen to judge and decide a disputed issue | Synonyms: arbitrator, umpire |
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| (noun) someone with the power to settle matters at will | Synonyms: supreme authority |
| archaebacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacterium, archaeobacteria, archeobacteria |
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| archaebacterium | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, 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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| archaeopteryx | (noun) extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds | Synonyms: Archaeopteryx lithographica, archeopteryx |
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| archenteron | (noun) central cavity of the gastrula; becomes the intestinal or digestive cavity | - |
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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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| archeopteryx | (noun) extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds | Synonyms: archaeopteryx, Archaeopteryx lithographica |
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| arrester | (noun) a restraint that slows airplanes as they land on the flight deck of an aircraft carrier | Synonyms: arrester hook |
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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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| arteriectasia | (noun) an abnormal distension of an artery | Synonyms: arteriectasis |
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| arteriectasis | (noun) an abnormal distension of an artery | Synonyms: arteriectasia |
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| arteriogram | (noun) an X ray of an artery filled with a contrast medium | - |
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| arteriography | (noun) roentgenographic examination of arteries | - |
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| arteriola | (noun) one of the small thin-walled arteries that end in capillaries | Synonyms: arteriole, capillary artery |
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| arteriole | (noun) one of the small thin-walled arteries that end in capillaries | Synonyms: arteriola, capillary artery |
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| arteriolosclerosis | (noun) sclerosis of the arterioles | - |
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| arteriosclerosis | (noun) sclerosis of the arterial walls | Synonyms: arterial sclerosis, coronary-artery disease, hardening of the arteries, induration of the arteries |
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| arteritis | (noun) inflammation of an artery | - |
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| artery | (noun) a major thoroughfare that bears important traffic | - |
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| (noun) a blood vessel that carries blood from the heart to the body | Synonyms: arteria, arterial blood vessel |
| assaulter | (noun) someone who attacks | Synonyms: aggressor, assailant, attacker |
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| assenter | (noun) a person who assents | - |
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| asserter | (noun) someone who claims to speak the truth | Synonyms: affirmer, asseverator, avower, declarer |
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| aster | (noun) star-shaped structure formed in the cytoplasm of a cell having fibers like rays that surround the centrosome during mitosis | - |
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| (noun) any of various chiefly fall-blooming herbs of the genus Aster with showy daisylike flowers | - |
| astereognosis | (noun) a loss of the ability to recognize objects by handling them | Synonyms: tactile agnosia |
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| asterion | (noun) the craniometric point at the junction of the lamboid suture and the occipitomastoid suture and the parietomastoid suture | - |
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