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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.
[Middle English knopwed : knop, knob; see knop + wed, weed; see weed1.]
[C15 knopwed; see knop, weed1]
any composite plant of the genus Centaurea, esp. the weedy C. nigra, having rose-purple flowers set on a dark-colored, knoblike bract.
[1400–50; late Middle English knopwed=knoppe a small rounded protuberance + weed1]
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|Noun||1.||knapweed - any of various plants of the genus Centaurea having purple thistlelike flowers|
slender knapweed - a variety of knapweed
Jersey knapweed - a variety of knapweed
centaury - any plant of the genus Centaurea
black knapweed, Centaurea nigra, hardheads, lesser knapweed - a weedy perennial with tough wiry stems and purple flowers; native to Europe but widely naturalized