any of several naturalized Eurasian plants of the genus Centaurea, especially C. calcitrapa, having purplish, spiny flower heads.
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How to use star thistle in a sentence
They are the yellow-flowered centaury, the mountain centaury, the star thistle and the rough centaury: the first predominates.The Life of the Fly | J. Henri Fabre
What is known as the purple star thistle was named for Chiron the Centaur.
British Dictionary definitions for star thistle
any of several plants of the genus Centaurea, esp C. calcitrapa, of Eurasia, which has spiny purplish flower heads: family Asteraceae (composites): See also centaury (def. 2)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012