bitterweed Meaning, Definition & Usage

  1. noun widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States
    bugloss; oxtongue; Picris echioides; bristly oxtongue.
  2. noun any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
    ambrosia; ragweed.

WordNet

Bit"ter*weed` noun
Definitions
  1. (Bot.) A species of Ambrosia (A. artemisiæfolia); Roman worm wood. Gray.

Webster 1913