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