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