- the soft, fine breast feathers, or down, of the eider, used as a stuffing for quilts, pillows, etc.
- a quilt stuffed with such feathers
Origin of eiderdownfrom Old Norse æthar-d?n: see eider and down
also eider down
- The down of the eider, used as stuffing for quilts and pillows.
- A quilt stuffed with the down of the eider.
- A warm napped fabric.
Origin of eiderdownSwedish ejderdun from Icelandic ædhar-dún ædhar genitive of ædhr eider ( from Old Norse ǣdhr ) dún down ( from Old Norse dūnn )