bit·ter·weed /ˈbɪtɚ/



 Bit·ter·weed n. Bot. A species of Ambrosia (Ambrosia artemisiæfolia); Roman worm wood.

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 bitterweed
      n 1: widespread European weed with spiny tongue-shaped leaves and
           yellow flowers; naturalized in United States [syn: 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 [syn: ragweed, ambrosia]