toxin-antitoxin n a mixture of toxin and antitoxin used esp. formerly in immunizing against a disease (as diphtheria) for which they are specific
* * *
(TA) tox·in-an·ti·tox·in (TA) (tok″sin-anґtĭ-tok″sin) a nearly neutral mixture of diphtheria toxin with its antitoxin; formerly used for immunization against diphtheria.Medical dictionary. 2011.