Hard″head′ (–hĕd′), n. 1. Clash or collision of heads in contest. Dryden.
2. (Zoöl.) (a) The menhaden. See Menhaden. (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).