I. | ̷ ̷(ˌ) ̷ ̷ˌ ̷ ̷ ̷ ̷|- adjective
Etymology: International Scientific Vocabulary anti- (I) + diphtheritic
: preventing diphtheria especially by immunization
immunization with antidiphtheritic toxoid
II. noun
( -s )
: an agent that prevents or modifies the course of diphtheria
antitoxin is an antidiphtheritic