from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A substance that has been treated to destroy its toxic properties but retains the capacity to stimulate production of antitoxins, used in immunization.

from The Century Dictionary.

  • noun A toxin which has lost its toxophoric group, but has retained the haptophoric group, so t. at it can still unite with the corresponding antitoxin. Such bodies result from the toxins by heat and age. They can be utilized in immunization, as though the toxophoric group were present.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Physiol. Chem.) An altered form of a toxin, possessing little or no toxic power.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A toxin that has had its toxic properties removed, but retains its ability to generate an immune response

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a bacterial toxin that has been weakened until it is no longer toxic but is strong enough to induce the formation of antibodies and immunity to the specific disease caused by the toxin


Sorry, no etymologies found.



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