great ragweed

from WordNet (r) 3.0 (2006)

great ragweed
    n 1: a coarse annual with some leaves deeply and palmately
         three-cleft or five-cleft [syn: {great ragweed}, {Ambrosia
         trifida}]

from 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]