Any of the common garden flowering plants of the genus Helleborus, in family Ranunculaceae, having supposed medicinal properties.

plural of hellebore

veratrum poisoning / (medicine, historical) The use of hellebore to treat insanity.

Of or relating to the hellebore.

plural of green hellebore

plural of black hellebore

An extremely toxic herbaceous perennial plant of the species Veratrum viride that is native to the western and eastern parts of the United States, but not the central part.

A poisonous and medicinal plant, Helleborus niger. / Another similarly poisonous and medicinal plant, the black false hellebore, Veratrum nigrum.

plural of false hellebore

Any plant in the genus Veratrum. / A flowering plant, Adonis vernalis.