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- Dictionarytoxin/ˈtɒksɪn/
noun
- 1. a poison of plant or animal origin, especially one produced by or derived from microorganisms and acting as an antigen in the body.
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noun
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A toxin is a naturally occurring poison produced by metabolic activities of living cells or organisms. They occur especially as proteins, often conjugated. The term was first used by organic chemist Ludwig Brieger (1849–1919) and is derived from the word "toxic". Wikipedia