Rag″weed′ (răg″wēd′), n.(Bot.) A common American composite weed (Ambrosia artemisiæfolia) with finely divided leaves; hogweed.
Great ragweed, a coarse American herb (Ambrosia trifida), with rough three-lobed opposite leaves.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.