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1. Either of two plants, Toxicodendron pubescens, a shrub of the southeast United States, or T. diversilobum, a shrub or vine of western North America, having compound leaves with three lobed or toothed leaflets, and causing a rash on contact.
2. See poison ivy.
3. A skin rash caused by contact with one of these plants.
either of two North American shrubs of the cashew family, Rhustoxicodendron, of the eastern U.S., or R.diversiloba, of the Pacific coastal area, with leaves resembling those of poison ivy: may cause allergic dermatitis when touched.
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|Noun||1.||poison oak - dermatitis resulting from contact with a poison oak plant|
Rhus dermatitis - contact dermatitis resulting from contact with plants of the genus Toxicodendron
|2.||poison oak - climbing plant common in eastern and central United States with ternate leaves and greenish flowers followed by white berries; yields an irritating oil that causes a rash on contact|
genus Toxicodendron, Toxicodendron - 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
poisonous plant - a plant that when touched or ingested in sufficient quantity can be harmful or fatal to an organism