'Helleborein' definitions:

Definition of 'Helleborein'

From: GCIDE

Helleborein \Hel`le*bo"re*in\, n. (Chem.) A poisonous glucoside accompanying helleborin in several species of hellebore, and extracted as a white crystalline substance with a bittersweet taste. It has a strong action on the heart, resembling digitalin. [1913 Webster]