ragweed

2 definitions found

ragweed - 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]

ragweed - WordNet (r) 2.1 (2005) :

  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]