Noun
A genus of perennial herbs (Helleborus) of the Crowfoot family, mostly having powerfully cathartic and even poisonous qualities. H. niger is the European black hellebore, or Christmas rose, blossoming in winter or earliest spring. H. officinalis was the officinal hellebore of the ancients.
Any plant of several species of the poisonous liliaceous genus Veratrum, especially V. album and V. viride, both called white hellebore.
Source: Webster's dictionaryAnd for mathematical science, he that doubts their certainty hath need of a dose of hellebore. Joseph Glanvill
I would rather take hellebore than spend a conversation with a good, little man. Edward Dahlberg
A plant called false hellebore (Veratrum californicum) if eaten by a sheep that is 13 days pregnant can cause the resulting lambs to have cyclopia (having only one eyeball in the center of their forehead). Source: Internet
And, once the flowers fade, the large leathery leaves of hellebore provide a nice back drop for later flowering herbaceous plants. Source: Internet