1.  grampus(n = noun.animal) killer, killer whale, orca, orcinus orca, sea wolf - predatory black-and-white toothed whale with large dorsal fin; common in cold seas;
is a kind of dolphin
is a member of genus orcinus, orcinus

2.  grampus(n = noun.animal) grampus griseus - slaty-grey blunt-nosed dolphin common in northern seas;
is a kind of dolphin
is a member of genus grampus

1.  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.

grampus, n. (pl. grampuses)
1 a dolphin, Grampus griseus, with a blunt snout and long pointed black flippers.
2 a person breathing heavily and loudly.

Etymology:
earlier graundepose, grapeys f. OF grapois etc. f. med.L craspiscis f. L crassus piscis fat fish

genus grampus, grampus griseus