Etymology
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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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Definitions of eiderdown

eiderdown (n.)
a soft quilt usually filled with the down of the eider;
Synonyms: duvet / continental quilt
eiderdown (n.)
down of the eider duck;
From wordnet.princeton.edu