"substance neutralizing poisons," 1892, from anti- "against" + toxin. Coined in 1890 by German bacteriologist Emil von Behring (1854-1917). Antitoxic "substance which counteracts a poison" is from 1860 in English.
antitheses
antithesis
antithetic
antithetical
antitoxic
antitoxin
anti-trust
antitype
antivenin
antivirus
anti-war
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