grampus
/ˈɡrampəs
/noun (plural grampuses)
1A cetacean of the dolphin family, in particular:
1.1 another term for Risso's dolphin.
1.2 another term for killer whale.
Origin
Early 16th century: alteration (by association with grand 'big') of Old French grapois, from medieval Latin craspiscis, from Latin crassus piscis 'fat fish'.