Source : Webster's Revised Unabridged Dictionary (1913)

Grampus \Gram"pus\, n.; pl. {Grampuses}. [Probably corrupted
   from It. gran pesce great fish, or Sp. gran pez, or Pg. gran
   peixe, all fr. L. grandis piscis. See {Grand}, and {Fish}.
   the animal.]
   1. (Zo["o]l.) A toothed delphinoid cetacean, of the genus
      {Grampus}, esp. {G. griseus} of Europe and America, which
      is valued for its oil. It grows to be fifteen to twenty
      feet long; its color is gray with white streaks. Called
      also {cowfish}. The California grampus is {G. Stearnsii}.

   2. A kind of tongs used in a bloomery. [U.S.]

Source : WordNet®

grampus
     n 1: predatory black-and-white toothed whale with large dorsal
          fin; common in cold seas [syn: {killer whale}, {killer},
           {orca}, {sea wolf}, {Orcinus orca}]
     2: slaty-gray blunt-nosed dolphin common in northern seas [syn:
         {Grampus griseus}]