Pronunciation: (bûrth'rOOt", -root"), [key]
1. Also called birthwort, purple trillium. a trillium, Trillium erectum, the roots of which were formerly used in medicine as an astringent.
2. any of certain other species of trillium.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.