A river in Germany, the boundary between Schleswig and Holstein.

Any of the species of the genera Polysticta or Somateria, in the seaduck subfamily Merginae, which line their nests with fine down (taken from their own bodies).

plural of eider

A sea duck in the eider family; Somateria mollissima.

plural of common eider

plural of king eider

A large sea duck that breeds along Arctic coasts, Somateria spectabilis.

(uncountable) The down of the eider duck, used for stuffing pillows and quilts. / (countable) A quilt stuffed with this down.

plural of eiderdown

An eider.