Search Result for "ragweed": 
Wordnet 3.0

NOUN (2)

1. widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity;
[syn: ragwort, tansy ragwort, ragweed, benweed, Senecio jacobaea]

2. any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma;
[syn: ragweed, ambrosia, bitterweed]

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2 definitions retrieved:

The Collaborative International Dictionary of English v.0.48:

Ragweed \Rag"weed`\ (r[a^]g"w[=e]d`), n. (Bot.) A common American composite weed (Ambrosia artemisiaefolia) with finely divided leaves; hogweed. [1913 Webster] Great ragweed, a coarse American herb (Ambrosia trifida), with rough three-lobed opposite leaves. [1913 Webster]
WordNet (r) 3.0 (2006):

ragweed n 1: widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity [syn: ragwort, tansy ragwort, ragweed, benweed, Senecio jacobaea] 2: any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma [syn: ragweed, ambrosia, bitterweed]