a mixture of toxin and antitoxin, formerly used to induce active immunity against certain diseases, especially diphtheria.
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British Dictionary definitions for toxin-antitoxin
a mixture of a specific toxin and antitoxin. The diphtheria toxin-antitoxin was formerly used in the US for active immunization
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012