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Noun: bitterweed  'bi-tu(r),weed
  1. Widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States
    - oxtongue, bristly oxtongue, 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
    - ragweed, ambrosia

Derived forms: bitterweeds

Type of: weed

Part of: genus Ambrosia, genus Picris, Picris

Encyclopedia: Bitterweed

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