toxin-antitoxin

noun Immunology.

1. a mixture of toxin and antitoxin, formerly used to induce active immunity against certain diseases, especially diphtheria.

noun

1. a mixture of a specific toxin and antitoxin. The diphtheria toxin-antitoxin was formerly used in the US for active immunization

n.

1. A mixture of a toxin and its antitoxin with a slight excess of toxin, formerly used as a vaccine.