A substance, resembling the bacterial toxins in its antigenic properties, found in the fluids of certain animals; e.g., in snake venom, the secretions of poisonous insects, eel blood. SYN: animal toxin.
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zoo·tox·in (zoґo-tok″sin) [zoo- + toxin] a toxic substance of animal origin, such as the venoms of snakes, spiders, and scorpions.Medical dictionary. 2011.