Main Entry:

ei·der·down

Pronunciation:

\-ˌdau̇n\

Function:

noun

Etymology:

probably from German Eiderdaune, from Icelandic æthardūnn, from æthur + dūnn ⁷down

Date:

1774

1 : the down of the eider 2 : a comforter filled with eiderdown 3 : a soft lightweight clothing fabric knitted or woven and napped on one or both sides