\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}).