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English definition of “eiderdown”

eiderdown

noun [C] uk   /ˈaɪ.də.daʊn/ us    /-dɚ-/
a thick covering for the top of a bed, filled with soft feathers or warm material, used especially in the pastBed linen and covers
(Definition of eiderdown from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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