from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A biennial Eurasian thistle (Cirsium vulgare) in the composite family, naturalized in North America and having heads of purplish flowers and spiny stems and leaves.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun European thistle with rather large heads and prickly leaves; extensively naturalized as a weed in the United States
from The American Heritage® Dictionary of the English Language, 4th Edition
[From its large head.]
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