The Simple English Wikipedia has an article on: Toxin Pronunciation (UK) IPA (key): /ˈtɒksɪn/ (US) IPA (key): /ˈtɑksɪn/ Audio (US)(file) Noun Singular toxin Plural toxins (countable) A toxin is a toxic substance that is produced by the biological processes of organisms. Synonym: poison Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads