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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Tar·weed n. Bot. A name given to several resinous-glandular composite plants of California, esp. to the species of Grindelia, Hemizonia, and Madia.
 

From: WordNet (r) 2.0

 tarweed
      n 1: any of various resinous glandular plants of the genus Madia;
           of western North and South America
      2: any of various western American plants of the genus
         Grindelia having resinous leaves and stems formerly used
         medicinally; often poisonous to livestock [syn: gumweed,
          gum plant, rosinweed]