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From The Collaborative International Dictionary of English v.0.48:
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. (Zool.) 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. [1913 Webster] 2. A kind of tongs used in a bloomery. [U.S.] Granade