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spear thistle is a noun meaning "European thistle with rather large heads and prickly leaves; extensively naturalized as a weed in the United States". It carries one recorded sense.
European thistle with rather large heads and prickly leaves; extensively naturalized as a weed in the United States
Definitions, synonyms and semantic relations for spear thistle come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.