Source : Webster's Revised Unabridged Dictionary (1913)

Dogfish \Dog"fish`\, n. (Zo["o]l.)
   1. A small shark, of many species, of the genera {Mustelus},
      {Scyllium}, {Spinax}, etc.

   Note: The European spotted dogfishes ({Scyllium catudus}, and
         {S. canicula}) are very abundant; the American smooth,
         or blue dogfish is {Mustelus canis}; the common picked,
         or horned dogfish ({Squalus acanthias}) abundant on
         both sides of the Atlantic.

   2. The bowfin ({Amia calva}). See {Bowfin}.

   3. The burbot of Lake Erie.

Source : WordNet®

Squalus acanthias
     n : destructive dogfish of the Atlantic coastal waters of
         America and Europe; widely used in anatomy classes [syn:
         {Atlantic spiny dogfish}]