Definitions for knapweedˈnæpˌwid
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Random House Webster's College Dictionary
knap•weedˈnæpˌwid(n.)
any composite plant of the genus Centaurea, esp. the weedy C. nigra, having rose-purple flowers set on a dark-colored, knoblike bract.
Category: Plants
Origin of knapweed:
1400–50; late ME knopwed=knoppe a small rounded protuberance +weed1
Princeton's WordNet
knapweed(noun)
any of various plants of the genus Centaurea having purple thistlelike flowers
Wiktionary
knapweed(Noun)
Any of various common weeds of the genus Centaurea, especially Centaurea nigra.
Origin: Alteration of knopweed.
Webster Dictionary
Knapweed(noun)
the black centaury (Centaurea nigra); -- so called from the knoblike heads of flowers. Called also bullweed
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