Noun has 2 senses

• tarweed(n = noun.plant) - any of various resinous glandular plants of the genus Madia; of western North and South America;




• tarweed(n = noun.plant) gum plant, gumweed, rosinweed - any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock;