ˈ ̷ ̷ ̷ ̷ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ ̷ ̷ noun
: a mixture of toxin and antitoxin used especially formerly in immunizing against the disease (as diphtheria) for which they are specific and characterized by engendering active immunity without the danger attendant upon use of a toxin alone