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Antitoxin | Define Antitoxin at Dictionary.com noun 1. a substance, formed in the body, that counteracts a specific toxin . 2. the antibody formed in immunization with a given toxin , used in treating certain ...
toxâ¢in. any poison produced by an organism, including the bacterial toxins that are the causative agents of tetanus, diphtheria, etc., and such plant and animal toxins as ricin and snake venom. [1885â90; tox (ic) + -in 1 ]. syn: See poison.. toxin-a poisonous substance produced during the metabolism and growth of certain microorganisms and some higher plant and animal species. ricin, ricin toxin-a toxic protein extracted from castor beans; used as a chemical reagent; can be used as a bioweapon; one milligram of ricin can kill an adult.