from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A perennial herb (Cirsium arvense) in the composite family, native to Europe and naturalized as a noxious weed in North America, having spiny-margined leaves and rose-purple or sometimes white flower heads.
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from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun European thistle naturalized in United States and Canada where it is a pernicious weed
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