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|Noun||1.||woolly thistle - biennial Eurasian white hairy thistle having pale purple flowers; naturalized in North America|
thistle - any of numerous plants of the family Compositae and especially of the genera Carduus and Cirsium and Onopordum having prickly-edged leaves
|2.||woolly thistle - thistle of western North America having white woolly leaves|
plume thistle, plumed thistle - any of numerous biennial to perennial herbs with handsome purple or yellow or occasionally white flower heads