Knapweed meaning

năp'wēd'
Any of various weedy thistlelike plants in the composite family having flowers grouped in a head with a spiny involucre, especially several species of the genus Centaurea and the Eurasian species Acroptilon repens.
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Any of several weedy plants (genus Centaurea) of the composite family; esp., a hardy perennial (C. nigra) with heads of rose-purple flowers.
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Any of various common weeds of the genus Centaurea.
  • Especially Centaurea nigra.
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Origin of knapweed

  • Middle English knopwed knop knob knop wed weed weed1
    From American Heritage Dictionary of the English Language, 5th Edition
  • Alteration of knopweed.
    From Wiktionary