[skawp] 
| any of several diving ducks of the genus Aythya, esp. A. marila (greater scaup), of the Northern Hemisphere, having a bluish-gray bill. |
| scaup (skôp) n. pl. scaup or scaups Either of two diving ducks (Aythya marila or A. affinis) having predominantly black and white plumage in the male. Also called bluebill. [Perhaps from Scots scalp, scaup, bed of mussels (from its feeding on shellfish).] |