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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 ...
toxin. n. 1. (Pathology) any of various poisonous substances produced by microorganisms that stimulate the production of neutralizing substances (antitoxins) in the body. See also endotoxin, exotoxin. 2. (Biology) any other poisonous substance of plant or animal origin.. 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. A poisonous or harmful nonbiological substance, such as a pollutant.