| alderfly | (noun) dark-colored insect having predaceous aquatic larvae | Synonyms: alder fly, Sialis lutaria |
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| alderman | (noun) a member of a municipal legislative body (as a city council) | - |
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| aldermanic | (adjective) of or relating to or like an alderman | Synonyms: aldermanly |
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| aldermanly | (adjective) of or relating to or like an alderman | Synonyms: aldermanic |
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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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| alert | (adjective) engaged in or accustomed to close observation | Synonyms: watchful |
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| (adjective) mentally perceptive and responsive | Synonyms: alive, awake |
| (adjective) quick and energetic | Synonyms: brisk, lively, merry, rattling, snappy, spanking, zippy |
| (noun) a warning serves to make you more alert to danger | Synonyms: alerting |
| (noun) an automatic signal (usually a sound) warning of danger | Synonyms: alarm, alarum, warning signal |
| (noun) condition of heightened watchfulness or preparation for action | Synonyms: qui vive |
| (verb) warn or arouse to a sense of danger or call to a state of preparedness | Synonyms: alarm |
| alerting | (noun) a warning serves to make you more alert to danger | Synonyms: alert |
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| (noun) a state of readiness to respond | Synonyms: alertness |
| alertly | (adverb) in mentally perceptive and responsive way | - |
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| alertness | (noun) lively attentiveness | Synonyms: on the qui vive, sharp-sightedness |
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| (noun) the process of paying close and continuous attention | Synonyms: vigilance, wakefulness, watchfulness |
| (noun) a state of readiness to respond | Synonyms: alerting |
| alfileria | (noun) European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage | Synonyms: alfilaria, clocks, Erodium cicutarium, filaree, filaria, pin clover, pin grass, redstem storksbill |
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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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| alkaliser | (noun) an agent that counteracts or neutralizes acidity (especially in the stomach) | Synonyms: alkalizer, antacid, antiacid, gastric antacid |
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| alkalizer | (noun) an agent that counteracts or neutralizes acidity (especially in the stomach) | Synonyms: alkaliser, antacid, antiacid, gastric antacid |
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| allayer | (noun) a person who reduces the intensity (e.g., of fears) and calms and pacifies | Synonyms: comforter, reliever |
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| allegoriser | (noun) someone who communicates in allegories | Synonyms: allegorizer |
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| allegorizer | (noun) someone who communicates in allegories | Synonyms: allegoriser |
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| allergen | (noun) any substance that can cause an allergy | - |
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| allergenic | (adjective) relating to or having the effect of an allergen | - |
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| allergic | (adjective) characterized by or caused by allergy | - |
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| (adjective) having an allergy or peculiar or excessive susceptibility (especially to a specific factor) | Synonyms: hypersensitised, hypersensitive, hypersensitized, sensitised, sensitized, supersensitised, supersensitive, supersensitized |
| allergist | (noun) a physician skilled in the diagnosis and treatment of allergies | - |
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| allergology | (noun) the branch of medical science that studies the causes and treatment of allergies | - |
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| allergy | (noun) hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity | Synonyms: allergic reaction |
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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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| allomerism | (noun) (chemistry) variability in chemical composition without variation in crystalline form | - |
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| allomerous | (adjective) pertaining to allomerism | - |
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| allover | (adjective) covering the entire surface | - |
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| almoner | (noun) an official in a British hospital who looks after the social and material needs of the patients | Synonyms: medical social worker |
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| almsgiver | (noun) a person who gives alms | - |
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| alphabetiser | (noun) a literate person who can arrange items in alphabetical order | Synonyms: alphabetizer |
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| alphabetizer | (noun) a literate person who can arrange items in alphabetical order | Synonyms: alphabetiser |
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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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| alstroemeria | (noun) any of various South American plants of the genus Alstroemeria valued for their handsome umbels of beautiful flowers | - |
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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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| altogether | (noun) informal terms for nakedness | Synonyms: birthday suit, raw |
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| (adverb) with everything included or counted | Synonyms: all told, in all |
| (adverb) with everything considered (and neglecting details) | Synonyms: all in all, on the whole, tout ensemble |
| (adverb) to a complete degree or to the full or entire extent; Completely or entirely | Synonyms: all, completely, entirely, right, totally, whole, wholly |
| aluminiferous | (adjective) containing alum or aluminum | - |
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| amber | (adjective) of a medium to dark brownish yellow color | Synonyms: brownish-yellow, yellow-brown |
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| (noun) a deep yellow color | Synonyms: gold |
| (noun) a hard yellowish to brownish translucent fossil resin; used for jewelry | - |
| amberbell | (noun) eastern North American dogtooth having solitary yellow flowers marked with brown or purple and spotted interiors | Synonyms: Erythronium americanum, trout lily, yellow adder's tongue |
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| amberfish | (noun) any of several amber to coppery fork-tailed warm-water carangid fishes | Synonyms: amberjack |
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| ambergris | (noun) waxy substance secreted by the sperm whale and found floating at sea or washed ashore; used in perfume | - |
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| amberjack | (noun) any of several amber to coppery fork-tailed warm-water carangid fishes | Synonyms: amberfish |
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| ambidexterity | (noun) the property of being equally skillful with each hand | Synonyms: ambidextrousness |
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| ambiversion | (noun) (psychology) a balanced disposition intermediate between extroversion and introversion | - |
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| ambiversive | (adjective) intermediate between introversive and extroversive | - |
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| ambler | (noun) someone who walks at a leisurely pace | Synonyms: saunterer, stroller |
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| ambusher | (noun) an attacker who waits in a concealed position to launch a surprise attack | - |
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| ameer | (noun) an independent ruler or chieftain (especially in Africa or Arabia) | Synonyms: amir, emeer, emir |
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| amentiferous | (adjective) (of plants) bearing or characterized by aments or catkins | Synonyms: amentaceous |
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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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| 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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| aminopherase | (noun) a class of transferases that catalyze transamination (that transfer an amino group from an amino acid to another compound) | Synonyms: aminotransferase, transaminase |
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| aminotransferase | (noun) a class of transferases that catalyze transamination (that transfer an amino group from an amino acid to another compound) | Synonyms: aminopherase, transaminase |
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| ammeter | (noun) a meter that measures the flow of electrical current in amperes | - |
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| amperage | (noun) the strength of an electrical current measured in amperes | - |
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| ampere | (noun) the basic unit of electric current adopted under the Systeme International d'Unites | Synonyms: A, amp |
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| (noun) a former unit of electric current (slightly smaller than the SI ampere) | Synonyms: international ampere |
| ampersand | (noun) a punctuation mark (&) used to represent conjunction (and) | - |
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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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| amplifier | (noun) electronic equipment that increases strength of signals passing through it | - |
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| anaerobe | (noun) an organism (especially a bacterium) that does not require air or free oxygen to live | - |
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| anaerobic | (adjective) living or active in the absence of free oxygen | Synonyms: anaerobiotic |
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| (adjective) not aerobic | - |
| anaerobiotic | (adjective) living or active in the absence of free oxygen | Synonyms: anaerobic |
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| analyser | (noun) an instrument that performs analyses | Synonyms: analyzer |
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| analyzer | (noun) an instrument that performs analyses | Synonyms: analyser |
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| anchorperson | (noun) a television reporter who coordinates a broadcast to which several correspondents contribute | Synonyms: anchor, anchorman |
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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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| anergy | (noun) reduction or lack of an immune response to a specific antigen | - |
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| (noun) inactivity and lack of energy | - |
| aneroid | (adjective) containing no liquid or actuated without the use of liquid | - |
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| (noun) a barometer that measures pressure without using fluids | Synonyms: aneroid barometer |
| anger | (noun) belligerence aroused by a real or supposed wrong (personified as one of the deadly sins) | Synonyms: ira, ire, wrath |
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| (noun) a strong emotion; a feeling that is oriented toward some real or supposed grievance | Synonyms: choler, ire |
| (noun) the state of being angry | Synonyms: angriness |
| (verb) make angry | - |
| (verb) become angry | Synonyms: see red |