ˌ ̷ ̷tēˈtäksə̇n, -təˈ- noun
Etymology: International Scientific Vocabulary anti- (I) + toxin
: 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 : a serum containing antitoxins — compare antivenin