| 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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| antipasto | (noun) a course of appetizers in an Italian meal | - |
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| antipathetic | (adjective) (usually followed by `to') strongly opposed | Synonyms: antipathetical, averse, indisposed, loath, loth |
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| (adjective) characterized by antagonism or antipathy | Synonyms: antagonistic, antipathetical |
| antipathetical | (adjective) (usually followed by `to') strongly opposed | Synonyms: antipathetic, averse, indisposed, loath, loth |
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| (adjective) characterized by antagonism or antipathy | Synonyms: antagonistic, antipathetic |
| antipathy | (noun) the object of a feeling of intense aversion; something to be avoided | - |
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| (noun) a feeling of intense dislike | Synonyms: aversion, distaste |
| antipersonnel | (adjective) designed to inflict death or personal injury rather than material destruction | - |
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| antiperspirant | (noun) an astringent substance applied to the skin to reduce perspiration | - |
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| antiphlogistic | (adjective) counteracting inflammation | - |
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| antiphon | (noun) a verse or song to be chanted or sung in response | Synonyms: antiphony |
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| antiphonal | (adjective) containing or using responses; alternating | Synonyms: responsive |
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| (adjective) relating to or resembling an antiphon or antiphony | Synonyms: antiphonary |
| (noun) bound collection of antiphons | Synonyms: antiphonary |
| antiphonary | (adjective) relating to or resembling an antiphon or antiphony | Synonyms: antiphonal |
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| (noun) bound collection of antiphons | Synonyms: antiphonal |
| antiphony | (noun) alternate (responsive) singing by a choir in two parts | - |
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| (noun) a verse or song to be chanted or sung in response | Synonyms: antiphon |
| antiphrasis | (noun) the use of a word in a sense opposite to its normal sense (especially in irony) | - |
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| antipodal | (adjective) relating to the antipodes or situated at opposite sides of the earth | Synonyms: antipodean |
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| (noun) the relation of opposition along a diameter | Synonyms: antipodal opposition, diametrical opposition |
| antipode | (noun) direct opposite | - |
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| antipodean | (adjective) relating to the antipodes or situated at opposite sides of the earth | Synonyms: antipodal |
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| antipodes | (noun) any two places or regions on diametrically opposite sides of the Earth | - |
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| antipollution | (adjective) intended to reduce pollution | - |
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| antipope | (noun) someone who is elected pope in opposition to another person who is held to be canonically elected | - |
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| antiproton | (noun) an unstable negatively charged proton; the antiparticle of a proton | - |
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| antiprotozoal | (noun) a medicinal drug used to fight diseases (like malaria) that are caused by protozoa | Synonyms: antiprotozoal drug |
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| antipruritic | (noun) a substance that relieves or prevents itching | - |
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| antipsychotic | (noun) tranquilizer used to treat psychotic conditions when a calming effect is desired | Synonyms: antipsychotic agent, antipsychotic drug, major tranquilizer, major tranquilliser, major tranquillizer, neuroleptic, neuroleptic agent, neuroleptic drug |
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| antipyresis | (noun) medication with antipyretics to treat a fever | - |
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| antipyretic | (adjective) preventing or alleviating fever | - |
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| (noun) any medicine that lowers body temperature to prevent or alleviate fever | Synonyms: febrifuge |
| antiquarian | (adjective) of or relating to antiques or antiquities | - |
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| (adjective) of or relating to persons who study or deal in antiques or antiquities | - |
| (noun) an expert or collector of antiquities | Synonyms: antiquary, archaist |
| antiquark | (noun) the antiparticle of a quark | - |
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| antiquary | (noun) an expert or collector of antiquities | Synonyms: antiquarian, archaist |
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| antiquate | (verb) give an antique appearance to | Synonyms: antique |
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| (verb) make obsolete or old-fashioned | - |
| antiquated | (adjective) so extremely old as seeming to belong to an earlier period | Synonyms: antediluvian, archaic |
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| antiquatedness | (noun) The state or quality of being outmoded or discredited by reason of age, of being out of style or fashion. | - |
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| antique | (adjective) made in or typical of earlier times and valued for its age | - |
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| (adjective) out of fashion | Synonyms: demode, ex, old-fashioned, old-hat, outmoded, passe, passee |
| (adjective) belonging to or lasting from times long ago | Synonyms: age-old |
| (noun) any piece of furniture or decorative object or the like produced in a former period and valuable because of its beauty or rarity | - |
| (noun) an elderly man | Synonyms: gaffer, old-timer, old geezer, oldtimer |
| (verb) give an antique appearance to | Synonyms: antiquate |
| (verb) shop for antiques | - |
| antiqueness | (noun) the quality or state of being in the style or fashion of former times. | - |
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| antiquity | (noun) an artifact surviving from the past | - |
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| (noun) extreme oldness | Synonyms: ancientness |
| (noun) the historic period preceding the Middle Ages in Europe | - |
| antiredeposition | (noun) the process of preventing redeposition | - |
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| antireligiousness | (noun) The state or condition of being opposed to religion. | - |
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| antisatellite | (adjective) of or relating to a system to destroy satellites in orbit | Synonyms: ASAT |
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| antisemitic | (adjective) relating to or characterized by anti-Semitism; hating Jews | Synonyms: anti-semitic |
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| antisemitism | (noun) the intense dislike for and prejudice against Jewish people | Synonyms: anti-Semitism |
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| antisepsis | (noun) the process of inhibiting the growth and multiplication of microorganisms | Synonyms: asepsis |
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| (noun) (of non-living objects) the state of being free of pathogenic organisms | Synonyms: asepsis, sterileness, sterility |
| antiseptic | (adjective) thoroughly clean and free of or destructive to disease-causing organisms | - |
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| (adjective) devoid of objectionable language | - |
| (adjective) clean and honest | - |
| (adjective) freeing from error or corruption | - |
| (noun) a substance that destroys micro-organisms that carry disease without harming body tissues | - |
| antisepticize | (verb) disinfect with an antiseptic | - |
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| antiserum | (noun) blood serum containing antibodies against specific antigens; provides immunity to a disease | - |
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| antisocial | (adjective) shunning contact with others | - |
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| (adjective) hostile to or disruptive of normal standards of social behavior | Synonyms: asocial |
| antispasmodic | (noun) a drug used to relieve or prevent spasms (especially of the smooth muscles) | Synonyms: antispasmodic agent, spasmolytic |
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| antistrophe | (noun) the section of a choral ode answering a previous strophe in classical Greek drama; the second of two metrically corresponding sections in a poem | - |
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| antistrophic | (adjective) of or relating to an antistrophe | - |
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| antisubmarine | (adjective) defensive against enemy submarines | - |
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| antisyphilitic | (noun) a drug (or other chemical agent) that is effective against syphilis | - |
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| antitank | (adjective) designed for defense against armored vehicles | - |
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| antitauon | (noun) an antilepton of very great mass | Synonyms: tau-plus particle |
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| antithesis | (noun) the juxtaposition of contrasting words or ideas to give a feeling of balance | - |
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| (noun) exact opposite | - |
| antithetic | (adjective) sharply contrasted in character or purpose | Synonyms: antithetical |
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| antithetical | (adjective) sharply contrasted in character or purpose | Synonyms: antithetic |
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| antithetically | (adverb) with antithesis; in an antithetical manner | - |
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