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 However, environmental groups and scientists are now warning that brush removal projects may actually exacerbate the risk of fire by inadvertently helping to spread invasive grasses such as black mustard, star thistle and ripgut grass. Joshua Emerson Smith, Los Angeles Times, "Cal Fire plans to rip out vegetation in San Diego County. But will that add fuel to a blaze?," 30 Sep. 2019 However, environmental groups and scientists are now warning that brush-removal projects may actually exacerbate the risk of fire by inadvertently helping to spread invasive grasses, such as black mustard, star thistle and ripgut bromus. San Diego Union-Tribune, "Will Cal Fire’s plan to rip out vegetation in San Diego lead to an explosion in flammable invasive grasses?," 30 Sep. 2019 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

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'star thistle.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of star thistle

1578, in the meaning defined at sense 1

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Time Traveler for star thistle

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The first known use of star thistle was in 1578

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Cite this Entry

“Star thistle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/star%20thistle. Accessed 4 Dec. 2020.

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