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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

Examples of star thistle in a Sentence

Recent Examples on the Web

 Working Dogs for Conservation has trained dogs to find spotted knapweed in Montana, Chinese bush clover in Iowa, yellow star thistle in Colorado, rosy wolf snails in Hawaii and brown tree snakes in Guam. — Washington Post, "Wags and weeds: Invasive plants meet match in detection dogs," 24 Aug. 2019

First Known Use of star thistle

1578, in the meaning defined at sense 1

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