Poison ash Meaning, Definition & Usage

  1. noun smooth American swamp shrub with pinnate leaves and greenish flowers followed by greenish white berries; yields an irritating oil
    poison dogwood; Toxicodendron vernix; poison sumac; Rhus vernix.

WordNet

Definitions
  1. . (Bot.) (a) A tree of the genus Amyris (A. balsamifera) found in the West Indies, from the trunk of which a black liquor distills, supposed to have poisonous qualities. (b) The poison sumac (Rhus venenata) . U. S.

Webster 1913