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 bitterweed bitterweed

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


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