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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. poison produced by living organisms. Toxins are classified as either exotoxins or endotoxins. Exotoxins are a diverse group of soluble proteins released into the surrounding tissue by living bacterial cells.acterial toxins are subdivided into exotoxins and endotoxins. Exotoxins, which are secreted into the environment as a result of the vital activities of bacteria, are specific in their effect on organisms. Examples include neurotoxins and cytotoxins.