| toxicodendron | (n) in some classifications: comprising those members of the genus Rhus having foliage that is poisonous to the touch; of North America and northern South America, Syn. genus Toxicodendron |
| eastern poison oak | (n) poisonous shrub of southeastern United States causing a rash on contact, Syn. Rhus toxicodenedron, Rhus quercifolia, Toxicodendron quercifolium |
| poison ash | (n) smooth American swamp shrub with pinnate leaves and greenish flowers followed by greenish white berries; yields an irritating oil, Syn. Toxicodendron vernix, Rhus vernix, poison dogwood, poison sumac |
| poison ivy | (n) climbing plant common in eastern and central United States with ternate leaves and greenish flowers followed by white berries; yields an irritating oil that causes a rash on contact, Syn. poison oak, Toxicodendron radicans, markweed, Rhus radicans, poison mercury |
| varnish tree | (n) small Asiatic tree yielding a toxic exudate from which lacquer is obtained, Syn. Japanese sumac, Toxicodendron vernicifluum, Japanese varnish tree, lacquer tree, Chinese lacquer tree, Rhus verniciflua, Japanese lacquer tree |
| western poison oak | (n) poisonous shrub of the Pacific coast of North America that causes a rash on contact, Syn. Rhus diversiloba, Toxicodendron diversilobum |