- poisonivy
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poison ivy
n. In both senses also called poison oak.
1. A North American shrub or vine (Toxicodendron radicans syn. Rhus radicans) that has compound leaves with three leaflets, small green flowers, and whitish berries and that causes a rash on contact.2. A skin rash caused by contact with this plant.
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Universalium. 2010.