Hypertext Webster Gateway: "toxin"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Toxin \Tox"in\, Toxine \Tox"ine\, n. [Gr. toxiko`n. See {Toxic}.
]
A poisonous product formed by pathogenic bacteria
From WordNet (r) 1.7 (wn)
toxin
n : a poisonous substance produced during the metabolism and
growth of certain microorganisms and some higher plant
and animal species
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