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Noun: hardheads
  1. A weedy perennial with tough wiry stems and purple flowers; native to Europe but widely naturalized
    - lesser knapweed, black knapweed, Centaurea nigra
Noun: hardhead  'haa(r)d,hed
  1. (metallurgy) residual ore that failed to melt during a smelting process
     
  2. A California salmon; the steelhead
     
  3. An Australian diving duck
     
  4. One who is hardheaded
     
  5. [Brit] Knapweed

Type of: knapweed

Encyclopedia: Hardheads

Hardhead, John