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Noun knapweed has 1 sense
  1. knapweed - any of various plants of the genus Centaurea having purple thistlelike flowers
    --1 is a kind of     centaury
    --1 has particulars:
     slender knapweed; Jersey knapweed; lesser knapweed, black knapweed, hardheads, Centaurea nigra; great knapweed, greater knapweed, Centaurea scabiosa
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