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Eider

(Science: zoology) Any species of sea duck of the genus Somateria, especially. Somateria mollissima, which breeds in the northern parts of Europe and America, and lines its nest with fine down (taken from its own body) which is an article of commerce; called also eider duck. The American eider (s. Dresseri), the king eider (s. Spectabilis), and the spectacled eider (Arctonetta Fischeri) are related species. Eider down. [Cf. Icel. Aeoardun, Sw. Eiderdun, dan. Ederduun] down of the eider duck, much sought after as an article of luxury.

Origin: Of Scand. Origin, cf. Icel aer; akin to Sw. Eider, dan. Ederfugl.