grampus (n.) Look up grampus at Dictionary.com
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 "fat fish," from Latin crassus "thick" + piscis "fish." For specifics of usage in English, see OED.