• (n.) 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.
Bry'o·nin noun (Chemistry) 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.