1. Against, opposing or, in relation to symptoms and diseases, curative. 2. Prefix denoting an antibody (immunoglobulin) specific for the thing indicated; e.g., antitoxin (antibody specific for a toxin). [G. anti, against, opposite, instead of]
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[Gr. anti against] a prefix signifying counteracting, effective against, opposing, or opposite; sometimes shortened to ant-.Medical dictionary. 2011.