Meaning of “eiderdown” in the English Dictionary

british dictionary

"eiderdown" in British English

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eiderdownnoun

uk /ˈaɪ.də.daʊn/ us /ˈaɪ.dɚ.daʊn/

[ C ] a thick covering for the top of a bed, filled with soft feathers or warm material:

She snuggled beneath the eiderdown.
Synonym

[ U ] the soft feathers of a duck, used for filling pillows, bed covers, etc.

(Definition of “eiderdown” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)