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poison oak

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poison oak

Main Entry:: poison oak
Function:: noun
Date:: 1743

1: any of several plants related to poison ivy and producing an oil with similar irritating properties: as a: a bushy plant (Toxicodendron diversilobum syn. Rhus diversiloba) of the Pacific coast b: a bushy plant (Toxicodendron toxicarium syn. Rhus toxicodendron) chiefly of the southeastern U.S. 2: poison ivy 1a

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