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1. (n.) poison oak
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.
Etymology: (1735–45, Amer.)
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| Definition of 'poison oak' |
Princeton's WordNet |
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1. (noun) poison oak
dermatitis resulting from contact with a poison oak plant
2. (noun) poison ivy, markweed, poison mercury, poison oak, Toxicodendron radicans, Rhus radicans
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
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Definitions of poison oak 
