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]

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2 definitions retrieved:

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]