eider down

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also eider down  (ī′dər-doun′)
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).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Its vivid yellows fairly screamed aloud; its whites were as eider down; its blacks glossy as the finest anthracite coal, and its coat long and shaggy as a mountain goat.
The landlord was near spraining his wrist, and I told him for heaven's sake to quit -- the bed was soft enough to suit me, and I did not know how all the planing in the world could make eider down of a pine plank.