bitterweed
1. [ noun ] (botany) widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States
Synonyms: bristly_oxtongue bugloss Picris_echioides oxtongue
Related terms: weed Picris
2. [ noun ] (botany) any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
Synonyms: ambrosia ragweed
Related terms: weed common_ragweed western_ragweed great_ragweed genus_Ambrosia
Similar spelling:   butterweed
  bitterwood
  battered
  bitter_dock
  bitterroot