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1. (n.) knapweed
any composite plant of the genus Centaurea, esp. the weedy C. nigra, having rose-purple flowers set on a dark-colored, knoblike bract.
Etymology: (1400–50; late ME knopwed=knoppe a small rounded protuberance +weed1)
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| Definition of 'knapweed' |
Princeton's WordNet |
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1. (noun) knapweed
any of various plants of the genus Centaurea having purple thistlelike flowers
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| Definition of 'knapweed' |
Webster Dictionary |
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1. (noun) knapweed
the black centaury (Centaurea nigra); -- so called from the knoblike heads of flowers. Called also bullweed
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Definitions of knapweed 
