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

eiderdown

noun
 
/ˈaɪdədaʊn/
 
/ˈaɪdərdaʊn/
(British English)
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  1. a thick, warm cover for a bed, filled with feathers or other soft material, and usually placed on top of a sheet and blankets
buttercup
noun
 
 
From the Topic
Plants and trees
C2
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