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