Definition of grampus in English:

grampus

Syllabification: gram·pus
Pronunciation: /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 orca.

Origin

early 16th century: alteration (by association with grand 'big') of Old French grapois, from medieval Latin craspiscis, from Latin crassus piscis 'fat fish'.

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