Noun: cotton thistle
- Biennial Eurasian white hairy thistle having pale purple flowers; naturalized in North America
"Cotton thistles dominated the abandoned field";
- woolly thistle, Scotch thistle, Onopordum acanthium, Onopordon acanthium
Derived forms: cotton thistles
Type of: thistle
Part of: genus Onopordon, genus Onopordum, Onopordon, Onopordum
Encyclopedia: Cotton thistle