Definition of 'bitterweed'

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Noun

1. widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States
      Synonyms: 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
      Synonyms: ragweed ambrosia

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