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| ei·der [ dər ] (plural ei·ders or ei·der) or ei·der duck |
noun |
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| Definition: |
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large sea duck: a large sea duck, the male of which has distinctive black-and-white feathers. The female, the source of eiderdown, has mottled brown feathers. Native to: northern hemisphere. Genus Somateria.
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| [Late 17th century. Via Icelandic æður< Old Norse æðr] |
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