cotton thistle

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Noun1.Cotton thistle - biennial Eurasian white hairy thistle having pale purple flowerscotton 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
genus Onopordon, genus Onopordum, Onopordon, Onopordum - a genus of Eurasian herbs of the family Compositae with prickly foliage and large purplish flowers