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