/gram"peuhs/ , n. , pl. grampuses .
1. a cetacean, Grampus griseus, of the dolphin family, widely distributed in northern seas.
2. any of various related cetaceans, as the killer whale, Orcinus ( Orca ) orca.
3. a giant whip scorpion common to Florida.
[ 1520-30; earlier grampoys, var. (by assimilation) of graundepose great fish, equiv. to graunde GRAND + pose, poys pois, peis pisce- (s. of piscis ) fish; r. ME gra ( s ) peis crassus piscis fat fish ]