The Collaborative International Dictionary
Bryonin
Bryonin \Bry"o*nin\, n. (Chem.) A bitter principle obtained from the root of the bryony ( Bryonia alba and Bryonia dioica). It is a white, or slightly colored, substance, and is emetic and cathartic.
Wiktionary
bryonin
n. (context organic compound English) An emetic substance obtained from bryony root.