rhus

noun
  1. any shrub or small tree of the anacardiaceous genus Rhus, several species of which are cultivated as ornamentals for their foliage, which assumes brilliant colours in autumnSee also sumach
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rhus in Medicine

Rhus

[rōōs, rŭs]
n.
  1. A genus of vines and shrubs including several species, especially poison ivy, poison oak, and poison sumac, producing oils that can cause dermatitis.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.