Scaup n.
 1. A bed or stratum of shellfish; scalp. [Scot.]
 2. Zool. A scaup duck. See below.
 Scaup duck Zool., any one of several species of northern ducks of the genus Aythya, or Fuligula. The adult males are, in large part, black. The three North American species are: the greater scaup duck (Aythya marila, var. nearctica), called also broadbill, bluebill, blackhead, flock duck, flocking fowl, and raft duck; the lesser scaup duck (Aythya affinis), called also little bluebill, river broadbill, and shuffler; the tufted, or ring-necked, scaup duck (Aythya collaris), called also black jack, ringneck, ringbill, ringbill shuffler, etc. See Illust. of Ring-necked duck, under Ring-necked. The common European scaup, or mussel, duck (Aythya marila), closely resembles the American variety.

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 Broad·bill n.
 1. Zool. A wild duck (Aythya marila, or Fuligula marila), which appears in large numbers on the eastern coast of the United States, in autumn; -- called also bluebill, blackhead, raft duck, and scaup duck. See Scaup duck.
 2. Zool. The shoveler. See Shoveler.

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 scaup duck
      n : diving ducks of North America having a bluish-gray bill
          [syn: scaup, bluebill, broadbill]