Definition of toxin noun from the Oxford Advanced Learner's Dictionary

 

toxin

 noun
noun
BrE BrE//ˈtɒksɪn//
 
; NAmE NAmE//ˈtɑːksɪn//
 
 
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a poisonous substance, especially one that is produced by bacteria in plants and animals The algae kills off plant and animal life and, in some cases, produces dangerous toxins. Word Origin late 19th cent.: from toxic + -in.
See the Oxford Advanced American Dictionary entry: toxin