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1. A pair of genes that encode a stable, toxic protein and a corresponding unstable antitoxin that is either a protein or RNA, found in many bacteria either on a plasmid or on the bacterial chromosome.
2. A mixture of a toxin and its antitoxin with a slight excess of toxin, formerly used as a vaccine.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Pharmacology) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014