a blackish North American duck, Melanitta deglandi, having a white patch on each wing.
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How to use white-winged scoter in a sentence
Left humerus, wild duck, (white-winged scoter, Melanitta deglandi).Contributions From the Museum of History and Technology | Ivor Noel Hume
The name Velvet Duck, though more commonly applied to the white-winged scoter, is also sometimes used to designate this species.Birds and Nature Vol. 9 No. 5 [May 1901] | Various