Main Entry: poison oak

Pronunciation: \-ˈōk\

Function: noun

1 : any of several plants included in the genus Rhus or sometimes in the genus Toxicodendron that produce an irritating oil like that of poison ivy: a : a bushy plant (R. diversiloba synonym T. diversilobum) of the Pacific coast b : a bushy plant (R. toxicodendron synonym T. pubescens) of the southeastern United States
2 : poison ivy 1a
3 : a skin rash produced by poison oak