1) Itch inducer 
(from the article `sumac`) Poison sumac, or poison elder (R. vernix, or in some classifications, Toxicodendron vernix), is an attractive narrow shrub or small tree native to ... ...caused by the resins of some species. The most notorious probably are poison oak (Toxicodendron diversiloba; see photograph) of western North ... [2 relat...
Rhus vernix, a North American tree that causes an allergic reaction similar to that of poison ivy. See also Rhus dermatitis.
[n] - dermatitis resulting from contact with a poison sumac plant
noun dermatitis resulting from contact with a poison sumac plant