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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Rag·weed n. Bot. A common American composite weed (Ambrosia artemisiaefolia) with finely divided leaves; hogweed.
 Great ragweed, a coarse American herb (Ambrosia trifida), with rough three-lobed opposite leaves.
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From: WordNet (r) 2.0

 Ambrosia trifida
      n : a coarse annual with some leaves deeply and palmately
          3-cleft or 5-cleft [syn: great ragweed]