Bull Thistle Definition

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.
American Heritage
Spear thistle.
Wiktionary
Synonyms:
  • Cirsium lanceolatum
  • Cirsium vulgare
  • boar thistle
  • spear-thistle

Other Word Forms of Bull Thistle

Noun

Singular:
bull thistle
Plural:
bull-thistles

Origin of Bull Thistle

  • From its large head

    From American Heritage Dictionary of the English Language, 5th Edition

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bull thistle