Ragweed

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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]

From WordNet (r) 2.0 [wn]:

  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}, {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: {ambrosia}, {bitterweed}]