- poisonoak
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poison oak
n.
1. Either of two shrubs, Toxicodendron toxicarium (syn. Rhus toxicodendron) of the southeast United States or T. diversilobum (syn. R. diversiloba) of western North America, related to poison ivy and causing a rash on contact.2. See poison ivy.3. A skin rash caused by contact with one of these plants.
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Universalium. 2010.