noun
1. : any of several American plants of the genus Rhus of climbing, shrubby, or occasionally arborescent habit that have ternate leaves, greenish flowers, and white berries and that produce an acutely irritating oil which causes a usually intensely itchy skin rash when the herbage especially if bruised is touched ; especially : a climbing plant ( R. radicans ) that is especially common in the eastern and central U.S. — see poison oak
2. or poison laurel : mountain laurel 1
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poison ivy 1a
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