| 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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| accouter | (verb) provide with military equipment | Synonyms: accoutre |
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| accoutered | (adjective) provided with necessary articles of equipment for a specialized purpose (especially military) | Synonyms: accoutred |
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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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| administer | (verb) give or apply (medications) | Synonyms: dispense |
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| (verb) administer or bestow, as in small portions | Synonyms: allot, deal, deal out, dish out, dispense, distribute, dole out, lot, mete out, parcel out, shell out |
| (verb) perform (a church sacrament) ritually | - |
| (verb) work in an administrative capacity; supervise or be in charge of | Synonyms: administrate |
| (verb) direct the taking of | - |
| 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 | (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 |
| adulterate | (adjective) mixed with impurities | Synonyms: adulterated, debased |
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| (verb) corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones | Synonyms: debase, dilute, load, stretch |
| adulterated | (adjective) mixed with impurities | Synonyms: adulterate, debased |
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| adulterating | (adjective) making impure or corrupt by adding extraneous materials | Synonyms: adulterant |
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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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| adulterine | (adjective) conceived in adultery | - |
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| adulterous | (adjective) characterized by adultery | Synonyms: extracurricular, extramarital |
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| (adjective) not faithful to a spouse or lover | Synonyms: cheating, two-timing |
| adulterously | (adverb) in an adulterous manner | - |
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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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| aflutter | (adjective) excited in anticipation | Synonyms: nervous |
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| after | (adjective) located farther aft | - |
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| (adverb) behind or in the rear | - |
| (adverb) happening at a time subsequent to a reference time | Synonyms: afterward, afterwards, later, later on, subsequently |
| 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 |
| aftermost | (adjective) located closest to the stern or tail | - |
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| 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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| aftershafted | (adjective) having an aftershaft (a small feather at the base of some feathers) | - |
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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 |
| afterward | (adverb) happening at a time subsequent to a reference time | Synonyms: after, afterwards, later, later on, subsequently |
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| afterwards | (adverb) happening at a time subsequent to a reference time | Synonyms: after, afterward, later, later on, subsequently |
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| afterworld | (noun) the place where you are after you die | - |
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| aglitter | (adjective) having brief brilliant points or flashes of light | Synonyms: coruscant, fulgid, glinting, glistering, glittering, glittery, scintillant, scintillating, sparkly |
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| alabaster | (adjective) of or resembling alabaster | Synonyms: alabastrine |
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| (noun) a very light white | - |
| (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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| alliterate | (verb) use alliteration as a form of poetry | - |
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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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| alliterative | (adjective) having the same consonant at the beginning of each stressed syllable | - |
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| alliteratively | (adverb) in an alliterative manner | - |
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| alliterator | (noun) a speaker or writer who makes use of alliteration | - |
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| alter | (verb) remove the ovaries of | Synonyms: castrate, neuter, spay |
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| (verb) become different in some particular way, without permanently losing one's or its former characteristics or essence | Synonyms: change, vary |
| (verb) cause to change; make different; cause a transformation | Synonyms: change, modify |
| (verb) insert words into texts, often falsifying it thereby | Synonyms: falsify, interpolate |
| (verb) make an alteration to | - |
| alterability | (noun) the quality of being alterable | - |
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| alterable | (adjective) capable of being changed or altered in some characteristic | - |
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| (adjective) (of the punishment ordered by a court) capable of being changed to one less severe | - |
| 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 |
| alterative | (adjective) tending to cure or restore to health | Synonyms: curative, healing, remedial, sanative, therapeutic |
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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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| altered | (adjective) changed in form or character without becoming something else | - |
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| (adjective) having testicles or ovaries removed | Synonyms: neutered |
| (adjective) changed in order to improve or made more fit for a particular purpose | Synonyms: adapted |
| altering | (noun) the sterilization of an animal | Synonyms: fixing, neutering |
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| alternate | (adjective) of leaves and branches etc; first on one side and then on the other in two ranks along an axis; not paired | - |
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| (adjective) serving or used in place of another | Synonyms: alternative, substitute |
| (adjective) occurring by turns; first one and then the other | Synonyms: alternating |
| (adjective) every second one of a series | - |
| (noun) someone who takes the place of another person | Synonyms: replacement, surrogate |
| (verb) do something in turns | Synonyms: take turns |
| (verb) go back and forth; swing back and forth between two states or conditions | Synonyms: jump |
| (verb) reverse (a direction, attitude, or course of action) | Synonyms: flip-flop, flip, interchange, switch, tack |
| (verb) be an understudy or alternate for a role | Synonyms: understudy |
| (verb) exchange people temporarily to fulfill certain jobs and functions | - |
| alternately | (adverb) in an alternating sequence or position | - |
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| alternating | (adjective) (of a current) reversing direction | - |
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| (adjective) occurring by turns; first one and then the other | Synonyms: alternate |
| alternation | (noun) successive change from one thing or state to another and back again | - |
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| alternative | (adjective) necessitating a choice between mutually exclusive possibilities | - |
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| (adjective) serving or used in place of another | Synonyms: alternate, substitute |
| (adjective) pertaining to unconventional choices | - |
| (noun) one of a number of things from which only one can be chosen | Synonyms: choice, option |
| alternatively | (adverb) in place of, or as an alternative to | Synonyms: instead, or else |
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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 |
| 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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| 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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| anicteric | (adjective) without jaundice | - |
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| (adjective) not affected by jaundice | - |
| 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 | (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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