a toxoid definition
Definition of TOXOID. : a toxin of a pathogenic organism treated so as to destroy its toxicity but leave it capable of inducing the formation of antibodies on injection. See toxoid defined for kids.ADVERTISEMENT. International Scientific Vocabulary.efinition of TOXOID. : a toxin of a pathogenic organism treated so as to destroy its toxicity but leave it capable of inducing the formation of antibodies on injection. See toxoid defined for kids.