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English definition of “toxin”

toxin

noun [C] uk   /ˈtɒk.sɪn/ us    /ˈtɑːk-/
a poisonous substance, especially one produced by bacteria, that causes diseaseBacteria, moulds, germs and virusesPoisoning and allergy
(Definition of toxin from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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