EIDER-DUCK
\ˈa͡ɪdədˈʌk], \ˈaɪdədˈʌk], \ˈaɪ_d_ə_d_ˈʌ_k]\
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n. [Swedish] A species of sea-duck about twice the size of the domestic duck, frequenting rocky shores and islands, and found in Orkney, the Shetlands, and especially in the Arctic regions. Its down has a high marketable value from its great lightness, elasticity, and warmth.