Definition of eiderdown noun from the Oxford Advanced Learner's Dictionary

 

eiderdown

 noun
noun
BrE BrE//ˈaɪdədaʊn//
 
; NAmE NAmE//ˈaɪdərdaʊn//
 
(British English)
 
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a thick, warm cover for a bed, filled with feathers or other soft material, and usually placed on top of a sheet and blankets