a toxin rendered nontoxic by treatment with chemical agents or by physical means and used for administration into the body in order to produce specific immunity by stimulating the production of antibodies.
Also called anatoxin.

1890–95; tox(in) + -oid Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
toxoid (ˈtɒksɔɪd)
a toxin that has been treated to reduce its toxicity and is used in immunization to stimulate production of antitoxins

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

toxoid tox·oid (tŏk'soid')
A substance that has been treated to destroy its toxic properties but that retains the capacity to stimulate production of antitoxins, used in immunization.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
toxoid   (tŏk'soid')  Pronunciation Key 
A substance that is normally toxic but has been treated to destroy its toxic properties without eliminating its capacity to stimulate the production of antitoxins by the immune system.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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