toxoid

(täkso̵id′)

noun

a toxin that has been treated, as with chemicals or heat, so as to eliminate the toxic qualities while retaining the antigenic properties

Origin: tox(in) + -oid

See toxoid in American Heritage Dictionary 4

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

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