D defs.my
Entry 1 sense Webster, 1913

Sea duck

/sē dŭk/ · Sea· duck · IPA
01 Any one of numerous species of ducks which frequent the seacoasts and feed mainly on fishes and mollusks. The scoters, eiders, old squaw, a…
  1. 1.
    Any one of numerous species of ducks which frequent the seacoasts and feed mainly on fishes and mollusks. The scoters, eiders, old squaw, and ruddy duck are examples. They may be distinguished by the lobate hind toe.(Zool.)