noun \ˌant-i-ˈtäk-sən\

Definition of ANTITOXIN

: an antibody that is capable of neutralizing the specific toxin (as a specific causative agent of disease) that stimulated its production in the body and is produced in animals for medical purposes by injection of a toxin or toxoid with the resulting serum being used to counteract the toxin in other individuals; also : an antiserum containing antitoxins

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