Xan`tho*rhi"za (?), n. [NL., fr. Gr. xanqo`s yellow + "ri`za root.] (Bot.)
A genus of shrubby ranunculaceous plants of North America, including only the species Xanthorhiza apiifolia, which has roots of a deep yellow color; yellowroot. The bark is intensely bitter, and is sometimes used as a tonic.
© Webster 1913