eider noun. ['ʌɪdǝ] L17.
[Icelandic æður genit. æðar in æðarfugl eider duck from Old Norse æðr. See also EIDERDOWN.]
1. Any large northern sea-duck of the genera Somateria and Polysticta; spec. S. mollissima, the male of which is largely black and white and the female dull brown, and which is the source of eider-down. Also eider duck. L17.
king-eider an Arctic eider, Somateria spectabilis, distinguished by the orange bill and frontal shield of the male.

2. = EIDERDOWN 1. M18.

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