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nounwidespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States
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nounany of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthmatype of:
Definition that contains bitterweed
- genus picris genus of weedy Old World yellow-flowered herbs usually containing a bitter-tasting substance: bitterweed
- picris genus of weedy Old World yellow-flowered herbs usually containing a bitter-tasting substance: bitterweed