Definitions for onopordum acanthium
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Princeton's WordNet
cotton thistle, woolly thistle, Scotch thistle, Onopordum acanthium, Onopordon acanthium(noun)
biennial Eurasian white hairy thistle having pale purple flowers; naturalized in North America
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"onopordum acanthium." Definitions.net. STANDS4 LLC, 2013. Web. 20 May 2013. <http://www.definitions.net/definition/onopordum acanthium>.

