noun Date: 1743 any of several plants related to poison ivy and producing an oil with similar irritating properties: as, a bushy plant ( Toxicodendron diversilobum syn. Rhus diversiloba ) of the Pacific coast, a bushy plant ( Toxicodendron toxicarium syn. Rhus toxicodendron ) chiefly of the southeastern United States, poison ivy 1a
POISON OAK
Meaning of POISON OAK in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012