Source : Webster's Revised Unabridged Dictionary (1913)

Hardhead \Hard"head`\, n.
   1. Clash or collision of heads in contest. --Dryden.

   2. (Zo["o]l.)
      (a) The menhaden. See {Menhaden}. [Local, U.S.]
      (b) Block's gurnard ({Trigla gurnardus}) of Europe.
      (c) A California salmon; the steelhead.
      (d) The gray whale. See {Gray whale}, under {Gray}.
      (e) A coarse American commercial sponge ({Spongia dura}).