1. An antibody formed in response to and capable of neutralizing a specific toxin of biological origin.
2. An animal or human serum containing antitoxins. It is used in medicine to prevent or treat diseases caused by the action of biological toxins, such as tetanus, botulism, and diphtheria.

Excerpted from The American Heritage Dictionary of the English Language, Third Edition Copyright © 1992 by Houghton Mifflin Company. Electronic version licensed from Lernout & Hauspie Speech Products N.V., further reproduction and distribution restricted in accordance with the Copyright Law of the United States. All rights reserved.

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