knapweed

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knap·weed

 (năp′wēd′)
n.
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.]

knapweed

(ˈnæpˌwiːd)
n
(Plants) any of several plants of the genus Centaurea, having purplish thistle-like flowers: family Asteraceae (composites). See also centaury2, hardheads
[C15 knopwed; see knop, weed1]

knap•weed

(ˈnæpˌwid)

n.
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]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.knapweed - any of various plants of the genus Centaurea having purple thistlelike flowersknapweed - 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
Centaurea scabiosa, great knapweed, greater knapweed - tall European perennial having purple flower heads
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