toxicodendron

Medical Dictionary

Toxicodendron Tox·i·co·den·dron (tŏk'sĭ-kō-děn'drŏn')
n.
An alternative genus for six species of poison ivies and poison oaks within the genus Rhus.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet
toxicodendron

noun
in some classifications: comprising those members of the genus Rhus having foliage that is poisonous to the touch; of North America and northern South America 
WordNet® 3.0, © 2006 by Princeton University.
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