Noun woolly thistle has 2 senses
- cotton thistle, woolly thistle, Scotch thistle, Onopordum acanthium, Onopordon acanthium - biennial Eurasian white hairy thistle having pale purple flowers; naturalized in North America
--1 is a kind of thistle
--1 is a member of Onopordum, genus Onopordum, Onopordon, genus Onopordon
- woolly thistle, Cirsium flodmanii - thistle of western North America having white woolly leaves
--2 is a kind of plume thistle, plumed thistle
--2 has particulars: European woolly thistle, Cirsium eriophorum
,