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Definition of Boar thistle
1. Noun. European thistle with rather large heads and prickly leaves; extensively naturalized as a weed in the United States.
Exact synonyms: Bull Thistle, Cirsium Lanceolatum, Cirsium Vulgare, Spear Thistle
Generic synonyms: Plume Thistle, Plumed Thistle
Generic synonyms: Plume Thistle, Plumed Thistle