HyperDic

English > 1 sense of the expression western poison oak:
NOUNplantwestern poison oak, Toxicodendron diversilobum, Rhus diversilobapoisonous shrub of the Pacific coast of North America that causes a rash on contact
English > western poison oak: 1 sense > noun 1, plant
Meaningpoisonous shrub of the Pacific coast of North America that causes a rash on contact.
SynonymsToxicodendron diversilobum, Rhus diversiloba
Member ofToxicodendron, genus ToxicodendronIn some classifications
Broaderpoisonous plantA plant that when touched or ingested in sufficient quantity can be harmful or fatal to an organism