Ragweed
Pronunciation : Rag"weed
Part of Speech : n.
Definition : Defn: A common American composite weed (Ambrosia artemisi?folia) with finely divided leaves; hogweed. Great ragweed, a coarse American herb (Ambrosia trifida), with rough three-lobed opposite leaves.
(Bot.)
Source : Webster's Unabridged Dictionary, 1913