Definition: rhus

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Source: WordNet (r) 1.7 

Rhus
     n : deciduous or evergreen shrubs and shrubby trees of temperate
         and subtropical North America, South Africa, eastern Asia
         and northeastern Australia; usually limited to
         nonpoisonous sumacs (see genus Toxicodendron) [syn: Rhus,
          genus Rhus]

Source: Webster's Revised Unabridged Dictionary (1913) 

Rhus \Rhus\, n. [L., sumac, fr. Gr. ???.] (Bot.)
   A genus of shrubs and small treets. See Sumac.