grampus
Concise Oxford English Dictionary © 2008 Oxford University Press:
grampus /ˈgrampəs/
▶noun (pl. grampuses) a killer whale or other cetacean of the dolphin family.
– origin C16: alt. (by assoc. with grand) of OFr. grapois, from med. L. craspiscis, from L. crassus piscis ‘fat fish’.
'grampus' also found in these Oxford entries:

