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Eider, name of several species of diving ducks of northern latitudes. The common eider is famed for the soft, insulating down of its breast, which it plucks to line its nest. Of commercial value, the down is collected to fill eiderdowns (comforters). In Iceland and Norway, eiders are encouraged to nest on “eider farms” for this purpose.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Dream to Eijkman, Christiaan