(n) any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock, Syn. gum plant, tarweed, rosinweed
n. any of various Western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock. Syn. -- gum plant, tarweed, rosinweed, rosin-weed. [ WordNet 1.5 ]