What is a bitter principle obtained from the root of the bryony (Bryonia alba and B. dioica). It is a white, or slightly colored, substance, and is emetic and cathartic called?

bryonin — A bitter principle obtained from the root of the bryony (Bryonia alba and B. dioica). It is a white, or slightly colored, substance, and is emetic and cathartic. (Webster's 1913.)

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