Definition of hardhead

  1. hardhead Noun A practical person; someone hardheaded.
  2. hardhead Noun A brown diving duck, "Aythya australis", native to Australia.
  3. hardhead Noun Any of various freshwater cyprinid fishes of the genus "Mylopharodon", or of saltwater sciaenid (Sciaenidae) fishes.
  4. hardhead Noun Any of several weeds in or formerly classified in the genus "Centaurea", particularly russian knapweed ("Acroptilon repens").
  5. hardhead Noun Residual ore that failed to melt during a smelting process.
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