n. pl. scaup or scaups
1. Either of two diving ducks (Aythya marila or A. affinis) of the Northern Hemisphere, the male of which has gray, black, and white plumage. Also called bluebill.
2. A small diving duck (Aythya novaeseelandiae) of New Zealand, having dark plumage.
[Short for scaup-duck, perhaps from Scots scalp, scaup, bed of mussels (from its feeding on shellfish).]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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