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bull thistle

noun
1.
a tall, spiny thistle, Cirsium vulgare, having heads of pink to purple flowers: a common weed in North America.
Origin
1860-1865
1860-65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for bull thistle
  • bull thistle is a biennial that reproduces solely by seed.
  • Also included are two county option weeds: multi-flora rose and bull thistle.

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