scaup

noun

Either of two diving ducks (Aythya marila or A. affinis) of the Northern Hemisphere, the male of which has gray, black, and white plumage.

A small diving duck (Aythya novaeseelandiae) of New Zealand, having dark plumage.

A duck, Fuligula or Fulix marila and related species.

A bed or stratum of shellfish; scalp.

A scaup duck. See below.