Etymology
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toxin (n.)

"organic poison," especially one produced by bacteria in an animal body, 1886, from toxic + -in (2).

updated on October 19, 2012

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Definitions of toxin from WordNet

toxin (n.)
a poisonous substance produced during the metabolism and growth of certain microorganisms and some higher plant and animal species;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.