a prefix meaning "against," "opposite of," "antiparticle of," used in the formation of compound words ( anticline ); used freely in combination with elements of any origin ( antibody; antifreeze; antiknock; antilepton ). Also, before a vowel, ant- .
[ ME antí; akin to Skt ánti opposite, L ante, MD ende ( > D en and), E an- in ANSWER. Cf. ANTE-, AND ]