Knapweed

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Knapweed \Knap"weed`\, n. (Bot.)
     The black centaury ({Centaurea nigra}); -- so called from the
     knoblike heads of flowers. Called also {bullweed}.
     [1913 Webster]

From WordNet (r) 2.0 [wn]:



  knapweed
       n : any of various plants of the genus Centaurea having purple
           thistlelike flowers