Definitions for boar thistle
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Princeton's WordNet
bull thistle, boar thistle, spear thistle, Cirsium vulgare, Cirsium lanceolatum(noun)
European thistle with rather large heads and prickly leaves; extensively naturalized as a weed in the United States
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"boar thistle." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/boar thistle>.

