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Canada thistle

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noun

an Old World plant, Cirsium arvense, having small purple or white flower heads, now a troublesome weed in North America.

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Origin of Canada thistle

An Americanism dating back to 1790–1800
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for canada thistle

Historical Examples of canada thistle

  • Little bits of Canada-thistle root half an inch long may send forth buds, and each bud grow to be an independent plant.

    Seed Dispersal

    William J. Beal

British Dictionary definitions for canada thistle

Canada thistle

noun

the US and Canadian name for creeping thistle
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