Onopordon acanthium ono·por·do·nacanthium uncommon noun 1. biennial Eurasian white hairy thistle having pale purple flowers; naturalized in North America Synonymscotton thistlewoolly thistleScotch thistleOnopordum acanthiumOnopordon acanthium Related words Broader terms thistle Parts Onopordum WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
