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grampus (n.)

a word applied to killer whales and other large, dolphin-like creatures, 1590s, earlier graundepose (1520s), altered (by influence of grand) from Middle English graspeys (late 13c.), from Anglo-French grampais, from Old French graspois, craspois "whale, (salted) whale meat; blubber; seal," from Medieval Latin craspicis, literally "great fish" or "fat fish," from Latin crassus "thick" (which is of unknown origin) + piscis "fish" (from PIE root *pisk- "a fish"). For specifics of usage in English, see OED.

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Definitions of grampus from WordNet

grampus (n.)
predatory black-and-white toothed whale with large dorsal fin; common in cold seas;
Synonyms: killer whale / killer / orca / sea wolf / Orcinus orca
grampus (n.)
slaty-grey blunt-nosed dolphin common in northern seas;
Synonyms: Grampus griseus
From wordnet.princeton.edu