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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. A poisonous substance produced by a living organism. Toxins can be products of ordinary metabolism (such as lactic acid), can be produced to kill or immobilize prey (such as the toxins in snake venom), or can be produced for self-defense (such as the cyanide produced by several plants).. 1. A poisonous substance, especially a protein, that is produced by living cells or organisms and is capable of causing disease when introduced into the body tissues but is often also capable of inducing neutralizing antibodies or antitoxins. 2.