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From The Collaborative International Dictionary of English v.0.48:
Veratrum \Ve*ra"trum\, prop. n. [L. veratrum hellebore.] (Bot.) A genus of coarse liliaceous herbs having very poisonous qualities. [1913 Webster] Note: Veratrum album of Europe, and Veratrum viride of America, are both called hellebore. They grow in wet land, have large, elliptical, plicate leaves in three vertical ranks, and bear panicles of greenish flowers. [1913 Webster]