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eiderdown

[ahy-der-doun] /ˈaɪ dərˌdaʊn/
noun
1.
down, or soft feathers, from the breast of the female eider duck.
2.
a heavy quilt or comforter, especially one filled with eiderdown.
3.
a warm, lightweight knitted or woven fabric of wool, cotton, or man-made fibers, napped on one or both sides, used for sleepwear, infants' clothing, etc.
Origin
1765-1775
1765-75; eider + down2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for eiderdown

eiderdown

/ˈaɪdəˌdaʊn/
noun
1.
the breast down of the female eider duck, with which it lines the nest, used for stuffing pillows, quilts, etc
2.
a thick warm cover for a bed, made of two layers of material enclosing a soft filling
3.
(US) a warm cotton fabric having a woollen nap
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for eiderdown
n.

1774; see eider + down (n.). Ultimately from Icelandic æðardun, via a Scandinavian source (cf. Danish ederdunn) or German Eiderdon.

Online Etymology Dictionary, © 2010 Douglas Harper
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14
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