[1] : The Collaborative International Dictionary of English v.0.48

hardhead \hard"head`\ -he^d`, n.
   1. clash or collision of heads in contest. --dryden.
      1913 webster

   2. zool.
      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.
          1913 webster hardheaded
see also:
menhaden trigla gurnardus gray whale gray spongia dura 

Dura >> D Words
Dura, definition of term: Dura
dura_pag1.html

Spongia >> S Words
Spongia, definition of term: Spongia
spongia_pag1.html

Dura Mater >> D Words
Dura Mater, definition of term: Dura Mater
dura+mater_pag1.html