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star thistle

noun
1.
any of several naturalized Eurasian plants of the genus Centaurea, especially C. calcitrapa, having purplish, spiny flower heads.
Also, star-thistle.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for star thistle
  • The yellow star thistle is one of many invasive and damaging non-native plants threatening the parks.
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 (sense 2)
Word Origin
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
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4
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