poison oak

poison oak

noun \-ˈōk\

Definition of POISON OAK

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