| anti | (adjective) not in favor of (an action or proposal etc.) | - |
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| (noun) a person who is opposed (to an action or policy or practice etc.) | - |
| antiacid | (noun) an agent that counteracts or neutralizes acidity (especially in the stomach) | Synonyms: alkaliser, alkalizer, antacid, gastric antacid |
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| antiadrenergic | (adjective) relating to blocking or reducing adrenergic effects in the body | - |
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| antiaircraft | (adjective) designed for defense from a surface position against air attack | - |
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| (noun) artillery designed to shoot upward at airplanes | Synonyms: ack-ack, ack-ack gun, antiaircraft gun, flack, flak, pom-pom |
| antialiasing | (noun) (computer graphics) a technique that is used to smooth jagged distortions in curves and diagonal lines so they appear smoother | - |
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| antiapartheid | (adjective) opposing the policy of apartheid in South Africa | - |
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| antiarrhythmic | (noun) a drug used to treat an abnormal heart rhythm | Synonyms: antiarrhythmic drug, antiarrhythmic medication |
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| antiauthoritarian | (adjective) opposed to authoritarianism | - |
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| antibacterial | (adjective) destroying bacteria or inhibiting their growth | - |
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| (noun) any drug that destroys bacteria or inhibits their growth | Synonyms: antibacterial drug, bactericide |
| antibaryon | (noun) the antiparticle of a baryon; a hadron with a baryon number of -1 | - |
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| antibiosis | (noun) an association between organisms that is harmful to one of them or between organisms and a metabolic product of another | - |
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| antibiotic | (adjective) of or relating to antibiotic drugs | - |
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| (noun) a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections | Synonyms: antibiotic drug |
| antiblack | (adjective) discriminatory especially on the basis of race or religion | Synonyms: anti-Semite, racist |
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| antibody | (noun) any of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes, thus producing an immune response | - |
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| antic | (adjective) ludicrously odd | Synonyms: fantastic, fantastical, grotesque |
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| (noun) a ludicrous or grotesque act done for fun and amusement | Synonyms: caper, joke, prank, put-on, trick |
| (verb) act as or like a clown | Synonyms: clown, clown around |
| anticancer | (adjective) used in the treatment of cancer | Synonyms: antineoplastic, antitumor, antitumour |
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| anticatalyst | (noun) (chemistry) a substance that retards a chemical reaction or diminishes the activity of a catalyst | - |
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| anticholinergic | (adjective) inhibiting or blocking the action of acetylcholine at a receptor site | - |
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| (noun) a substance that opposes or blocks the action of acetylcholine | Synonyms: anticholinergic drug |
| anticholinesterase | (noun) a medicine that inhibits cholinesterase by combining with it and so has a cholinergic effect | - |
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| anticipant | (adjective) marked by eager anticipation | Synonyms: anticipative, expectant |
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| (noun) one who anticipates | Synonyms: anticipator |
| anticipate | (verb) be a forerunner of or occur earlier than | - |
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| (verb) regard something as probable or likely | Synonyms: expect |
| (verb) realize beforehand | Synonyms: foreknow, foresee, previse |
| (verb) make a prediction about; tell in advance | Synonyms: call, forebode, foretell, predict, prognosticate, promise |
| (verb) be excited or anxious about | Synonyms: look for, look to |
| (verb) act in advance of; deal with ahead of time | Synonyms: counter, foresee, forestall |
| anticipated | (adjective) expected hopefully | Synonyms: awaited, hoped-for |
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| anticipation | (noun) the act of predicting (as by reasoning about the future) | Synonyms: prediction, prevision |
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| (noun) something expected (as on the basis of a norm) | Synonyms: expectancy |
| (noun) an expectation | Synonyms: expectancy |
| (noun) anticipating with confidence of fulfillment | Synonyms: expectation |
| anticipative | (adjective) marked by eager anticipation | Synonyms: anticipant, expectant |
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| anticipator | (noun) one who anticipates | Synonyms: anticipant |
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| anticipatory | (adjective) in anticipation | Synonyms: prevenient |
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| anticlimactic | (adjective) coming after the climax especially of a dramatic or narrative plot | - |
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| (adjective) of or relating to a sudden change from an impressive to a ludicrous style | Synonyms: anticlimactical |
| anticlimactical | (adjective) of or relating to a sudden change from an impressive to a ludicrous style | Synonyms: anticlimactic |
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| anticlimax | (noun) a change from a serious subject to a disappointing one | Synonyms: bathos |
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| (noun) a disappointing decline after a previous rise | - |
| anticlinal | (adjective) sloping downward away from a common crest | - |
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| anticlockwise | (adjective) in the direction opposite to the rotation of the hands of a clock | Synonyms: contraclockwise, counterclockwise |
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| (adverb) in a direction opposite to the direction in which the hands of a clock move | Synonyms: counterclockwise |
| anticoagulant | (noun) medicine that prevents or retards the clotting of blood | Synonyms: anticoagulant medication, decoagulant |
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| anticoagulation | (noun) the administration of an anticoagulant drug to retard coagulation of the blood | - |
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| anticoagulative | (adjective) of or relating to an anticoagulant | - |
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| anticonvulsant | (noun) a drug used to treat or prevent convulsions (as in epilepsy) | Synonyms: anticonvulsant drug, antiepileptic, antiepileptic drug |
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| anticyclone | (noun) (meteorology) winds spiraling outward from a high pressure center; circling clockwise in the Northern Hemisphere and counterclockwise in the southern | - |
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| anticyclonic | (adjective) of or relating to or characteristic of the atmosphere around a high pressure center | - |
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| antidepressant | (noun) any of a class of drugs used to treat depression; often have undesirable side effects | Synonyms: antidepressant drug |
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| antidiabetic | (noun) a drug used to treat diabetes mellitus | Synonyms: antidiabetic drug |
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| antidiarrheal | (noun) a drug used to control or stop diarrhea | Synonyms: antidiarrheal drug |
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| antidiuretic | (noun) a drug that limits the formation of urine | Synonyms: antidiuretic drug |
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| antidotal | (adjective) counteracting the effects of a poison | - |
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| antidote | (noun) a remedy that stops or controls the effects of a poison | Synonyms: counterpoison |
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| antidromic | (adjective) conducting nerve impulses in a direction opposite to normal | - |
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| antielectron | (noun) an elementary particle with positive charge; interaction of a positron and an electron results in annihilation | Synonyms: positron |
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| antiemetic | (noun) a drug that prevents or alleviates nausea and vomiting | Synonyms: antiemetic drug |
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| antiepileptic | (noun) a drug used to treat or prevent convulsions (as in epilepsy) | Synonyms: anticonvulsant, anticonvulsant drug, antiepileptic drug |
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| antiestablishmentarianism | (noun) the doctrine of opposition to the social and political establishment | Synonyms: antiestablishmentism |
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| antiestablishmentism | (noun) the doctrine of opposition to the social and political establishment | Synonyms: antiestablishmentarianism |
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| antifeminism | (noun) activity indicative of belief in the superiority of men over women | Synonyms: chauvinism, male chauvinism |
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| antifeminist | (noun) someone who does not believe in the social or economic or political equality of men and women | - |
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| antiferromagnet | (noun) any material that has antiferromagnetic properties. | - |
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| antiferromagnetic | (adjective) relating to antiferromagnetism | - |
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| antiferromagnetism | (noun) magnetic field creates parallel but opposing spins; varies with temperature | - |
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| antifertility | (adjective) capable of preventing conception or impregnation | Synonyms: contraceptive, prophylactic |
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| antifertilizin | (noun) An immunologically specific substance produced by animal sperm to implement attraction by the egg before fertilization. | - |
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| antiflatulent | (noun) any agent that reduces intestinal gas | - |
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| antifreeze | (noun) a liquid added to the water in a cooling system to lower its freezing point | - |
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| antifungal | (adjective) capable of destroying fungi | Synonyms: fungicidal |
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| (noun) any agent that destroys or prevents the growth of fungi | Synonyms: antifungal agent, antimycotic, antimycotic agent, fungicide |
| antigen | (noun) any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies) | - |
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| antigenic | (adjective) of or relating to antigens | - |
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| antigram | (noun) an anagram that means the opposite of the original word or phrase | - |
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| antiheretical | (adjective) opposed to heresy | - |
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| antihero | (noun) a protagonist who lacks the characteristics that would make him a hero (or her a heroine) | - |
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| antihistamine | (noun) a medicine used to treat allergies and hypersensitive reactions and colds; works by counteracting the effects of histamine on a receptor site | - |
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| antihypertensive | (noun) a drug that reduces high blood pressure | Synonyms: antihypertensive drug |
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| antiknock | (adjective) suppressing or eliminating engine knock in combustion engines | Synonyms: antiknocking |
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| (noun) any of various compounds that are added to gasoline to reduce engine knocking | - |
| antiknocking | (adjective) suppressing or eliminating engine knock in combustion engines | Synonyms: antiknock |
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| antilepton | (noun) the antiparticle of a lepton | - |
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| antilog | (noun) the number of which a given number is the logarithm | Synonyms: antilogarithm |
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| antilogarithm | (noun) the number of which a given number is the logarithm | Synonyms: antilog |
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| antilogism | (noun) an inconsistent triad of propositions in logic of which two are premises of a valid syllogism while the third is the contradictory of its conclusion. | - |
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| antimacassar | (noun) a piece of ornamented cloth that protects the back of a chair from hair oils | - |
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| antimagnetic | (adjective) impervious to the effects of a magnetic field; resistant to magnetization | - |
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| antimalarial | (noun) a medicinal drug used to prevent or treat malaria | Synonyms: antimalarial drug |
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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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| antimeson | (noun) the antiparticle of a meson | - |
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| antimetabolite | (noun) an antineoplastic drug that inhibits the utilization of a metabolite | - |
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| antimetathesis | (noun) A rhetorical figure resulting from a reverted arrangement in the last clause of a sentence of the two principal words of the clause preceding; inversion of the members of an antithesis: as, "A poem is a speaking picture; a picture a mute poem". | - |
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| antimicrobial | (adjective) capable of destroying or inhibiting the growth of disease-causing microorganisms | Synonyms: antimicrobic |
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| (noun) an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease | Synonyms: antimicrobic, disinfectant, germicide |
| antimicrobic | (adjective) capable of destroying or inhibiting the growth of disease-causing microorganisms | Synonyms: antimicrobial |
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| (noun) an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease | Synonyms: antimicrobial, disinfectant, germicide |
| antimonial | (adjective) containing antimony | - |
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| antimonic | (adjective) relating to or derived from antimony | Synonyms: antimonious |
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| antimonious | (adjective) relating to or derived from antimony | Synonyms: antimonic |
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| antimonopoly | (adjective) of laws and regulations; designed to protect trade and commerce from unfair business practices | Synonyms: antitrust |
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| antimony | (noun) a metallic element having four allotropic forms; used in a wide variety of alloys; found in stibnite | Synonyms: atomic number 51, Sb |
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| antimuon | (noun) the antiparticle of a muon; decays to positron and neutrino and antineutrino | Synonyms: positive muon |
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| antimycin | (noun) a crystalline antibiotic active against various fungi | - |
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| antimycotic | (noun) any agent that destroys or prevents the growth of fungi | Synonyms: antifungal, antifungal agent, antimycotic agent, fungicide |
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| antineoplastic | (adjective) used in the treatment of cancer | Synonyms: anticancer, antitumor, antitumour |
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| (noun) any of several drugs that control or kill neoplastic cells; used in chemotherapy to kill cancer cells; all have unpleasant side effects that may include nausea and vomiting and hair loss and suppression of bone marrow function | Synonyms: antineoplastic drug, cancer drug |
| antineutrino | (noun) the antiparticle of a neutrino | - |
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| antineutron | (noun) the antiparticle of a neutron | - |
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| antinode | (noun) (physics) the point of maximum displacement in a periodic system | - |
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| antinomasia | (noun) substitution of a title for a name | - |
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| antinomian | (adjective) relating to or influenced by antinomianism | - |
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| (noun) a follower of the doctrine of antinomianism | - |
| antinomianism | (noun) the theological doctrine that by faith and God's grace a Christian is freed from all laws (including the moral standards of the culture) | - |
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| antinomy | (noun) a contradiction between two statements that seem equally reasonable | - |
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| antioxidant | (noun) substance that inhibits oxidation or inhibits reactions promoted by oxygen or peroxides | - |
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| antiparallel | (adjective) (especially of vectors) parallel but oppositely directed | - |
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| antiparticle | (noun) a particle that has the same mass as another particle but has opposite values for its other properties; interaction of a particle and its antiparticle results in annihilation and the production of radiant energy | - |
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