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phy·to·tox·in -'täk-sən n a toxin (as ricin) produced by a plant
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n.
any poisonous substance (toxin) produced by a plant, such as any of the toxins produced by fungi of the genus Amanita.
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phy·to·tox·in (fiґto-tok″sin) 1. any toxic substance of plant origin. 2. any of a group of exotoxins produced by certain species of higher plants; they are resistant to proteolytic digestion, and are effective when taken by mouth. Included are abrin, crotin, ricin, and robin.Medical dictionary. 2011.