| antiknock | (noun) any of various compounds that are added to gasoline to reduce engine knocking | - |
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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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| 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 | (noun) an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease | Synonyms: antimicrobic, disinfectant, germicide |
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| antimicrobic | (noun) an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease | Synonyms: antimicrobial, disinfectant, germicide |
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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 | (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 |
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| 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 | (noun) a follower of the doctrine of antinomianism | - |
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| 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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| 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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| 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 |
| antiperspirant | (noun) an astringent substance applied to the skin to reduce perspiration | - |
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| antiphon | (noun) a verse or song to be chanted or sung in response | Synonyms: antiphony |
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| antiphonal | (noun) bound collection of antiphons | Synonyms: antiphonary |
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| antiphonary | (noun) bound collection of antiphons | Synonyms: antiphonal |
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| 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 | (noun) the relation of opposition along a diameter | Synonyms: antipodal opposition, diametrical opposition |
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| antipode | (noun) direct opposite | - |
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| antipodes | (noun) any two places or regions on diametrically opposite sides of the Earth | - |
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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 | (noun) any medicine that lowers body temperature to prevent or alleviate fever | Synonyms: febrifuge |
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| antiquarian | (noun) an expert or collector of antiquities | Synonyms: antiquary, archaist |
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| 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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| 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 | (noun) any piece of furniture or decorative object or the like produced in a former period and valuable because of its beauty or rarity | - |
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| (noun) an elderly man | Synonyms: gaffer, old-timer, old geezer, oldtimer |
| 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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| 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 | (noun) a substance that destroys micro-organisms that carry disease without harming body tissues | - |
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| antiserum | (noun) blood serum containing antibodies against specific antigens; provides immunity to a disease | - |
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| 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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| antisyphilitic | (noun) a drug (or other chemical agent) that is effective against syphilis | - |
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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 | - |
| antitoxin | (noun) an antibody that can neutralize a specific toxin | - |
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| antitrade | (noun) winds blowing from west to east and lying above the trade winds in the tropics | Synonyms: antitrade wind |
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| antitrades | (noun) wind in the upper atmosphere blowing above but in the opposite direction from the trade winds | - |
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| antitussive | (noun) any medicine used to suppress or relieve coughing | - |
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| antitype | (noun) a person or thing represented or foreshadowed by an earlier type or symbol; especially a figure or event in the New Testament having a counterpart in the Old Testament | - |
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| (noun) an opposite or contrasting type | - |
| antivenene | (noun) an antitoxin that counteracts the effects of venom from the bite of a snake or insect or other animal | Synonyms: antivenin |
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| antivenin | (noun) an antitoxin that counteracts the effects of venom from the bite of a snake or insect or other animal | Synonyms: antivenene |
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| antiviral | (noun) any drug that destroys viruses | Synonyms: antiviral agent, antiviral drug |
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| antler | (noun) deciduous horn of a member of the deer family | - |
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| antlion | (noun) winged insect resembling a dragonfly; the larvae (doodlebugs) dig conical pits where they wait to catch e.g. ants | Synonyms: ant lion, antlion fly |
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| (noun) the larva of any of several insects | Synonyms: ant lion, doodlebug |
| antonym | (noun) a word that expresses a meaning opposed to the meaning of another word, in which case the two words are antonyms of each other | Synonyms: opposite, opposite word |
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| antonymy | (noun) the semantic relation that holds between two words that can (in a given context) express opposite meanings | - |
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| antrum | (noun) a natural cavity or hollow in a bone | - |
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