eider down


ei·der·down

also eider down E0058900 (ī′dər-doun′)n.1. The down of the eider, used as stuffing for quilts and pillows.2. A quilt stuffed with the down of the eider.3. A warm napped fabric.
[Swedish ejderdun, from Icelandic ædhar-dún : ædhar, genitive of ædhr, eider (from Old Norse ǣdhr) + dún, down (from Old Norse dūnn).]