any of several diving ducks of the genus Aythya, especially A. marila (greater scaup) of the Northern Hemisphere, having a bluish-gray bill.
Also called scaup duck.

1665–75; by ellipsis from scaup duck, probably with Scots, N dial. scaup, scalp mussel bed (of uncertain origin) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
scaup or scaup duck (skɔːp)
bluebill, Also called (US): broadbill either of two diving ducks, Aythya marila (greater scaup) or A. affinis (lesser scaup), of Europe and America, having a black-and-white plumage in the male
[C16: Scot variant of scalp]
scaup duck or scaup duck
[C16: Scot variant of scalp]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Testing competing hypotheses for chronology and intensity of lesser scaup molt during winter and spring migration.
In flight, the dark wings are different from the white-edged wings of scaup.
Individual scaup will be identified with colored bill markers.
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