The Collaborative International Dictionary
elleborin
Helleborin \Hel*leb"o*rin\ (? or ?), n. (Chem.) A poisonous glucoside found in several species of hellebore, and extracted as a white crystalline substance with a sharp tingling taste. It possesses the essential virtues of the plant; -- called also elleborin.
Wiktionary
elleborin
n. (archaic form of helleborin English)