Definition of poison sumac in English:

poison sumac

noun

  • A pinnate-leaved shrub or small tree of swamps in eastern North America, Toxicodendron vernix (family Anacardiaceae), related to poison ivy and containing a similar toxic resin which often causes severe dermatitis when touched; also called "poison ash", poison dogwood, poison elder.

Origin

Late 18th century; earliest use found in Humphry Marshall (1722–1801).