eiderdown
n.
"soft feathers of the eider-duck" (such as it uses to line its nest), 1774; see eider + down, n.1. Ultimately from Icelandic æðardun, via a Scandinavian source (compare Danish ederdunn) or German Eiderdon.
| 词汇 | eiderdown | 
| 词根词缀 | Online Etymology Dictionary eiderdown n. "soft feathers of the eider-duck" (such as it uses to line its nest), 1774; see eider + down, n.1. Ultimately from Icelandic æðardun, via a Scandinavian source (compare Danish ederdunn) or German Eiderdon. | 
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