Definition of "eider-duck" [eider-duck]

• A duck of the subfamily Fuligulinæ and genus Somateria; especially, the common Somateria mollissima, which inhabits both coasts of the North Atlantic. (noun)

The Century Dictionary (Public Domain)

• "Eider-down consists of the soft, fine feathers growing on the breast of the eider-duck, great numbers of which frequent the coast and lakes of"
• "The snow-geese are the first to arrive; next come the common and eider-duck; after them the great northern black-and-red-throated divers; and last of all the pin-tail and the long-tail ducks."
• "The eider-duck, so much prized for its down, is found in considerable numbers."