Hardhead

Noun

  • (obsolete) Clash or collision of heads in contest.
  • A brown diving duck, Aythya australis, native to Australia.
  • (metallurgy) Residual ore that failed to melt during a smelting process.
  • One who is practical or hardheaded.
  • Any of several weeds in or formerly classified in the genus Centaurea, particularly Russian knapweed (Acroptilon repens).
  • Any of various freshwater cyprinid fishes of the genus Mylopharodon, or of saltwater sciaenid (Sciaenidae) fishes.

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