Search Result for "bitterweed": 
Wordnet 3.0

NOUN (2)

1. widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States;
[syn: oxtongue, bristly oxtongue, bitterweed, bugloss, Picris echioides]

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]



The Collaborative International Dictionary of English v.0.48:

Bitterweed \Bit"ter*weed`\, n. (Bot.)
   A species of Ambrosia (Ambrosia artemisi[ae]folia); Roman
   worm wood. --Gray.
   [1913 Webster]


WordNet (r) 3.0 (2006):

bitterweed
    n 1: widespread European weed with spiny tongue-shaped leaves
         and yellow flowers; naturalized in United States [syn:
         oxtongue, bristly oxtongue, bitterweed, bugloss,
         Picris echioides]
    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]