star thistle

noun

Definition of star thistle 

1 : a widely naturalized spiny Old World knapweed (Centaurea calcitrapa) with purple flowers

called also caltrops

2 : any of various knapweeds related to the star thistle

First Known Use of star thistle

1578, in the meaning defined at sense 1

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The first known use of star thistle was in 1578

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