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star thistle

or star-this·tle

noun
  1. any of several naturalized Eurasian plants of the genus Centaurea, especially C. calcitrapa, having purplish, spiny flower heads.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for star thistle

star thistle

noun
  1. 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)
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Word Origin for star thistle

C16: so called because it has a thistle-shaped flower surrounded by radiating spines
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