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eicosapentaenoic acid
Eid
Eid al-Adha
Eid al-Fitr
Eid ul-Adha
Eid ul-Fitr
eider
eider duck
eiderdown
eidetic
eidolon
Eiffel Tower
eigenfrequency
eigenvalue
Eiger
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eiderdown

ei·der·down [ dər dòwn ] (plural ei·der·downs)


noun 
Definition:
 
1. eider duck's feathers: the soft fluffy breast feathers of the female eider duck, used for stuffing pillows and bed coverings

2. bed covering: a warm bed covering in the form of a quilt or duvet stuffed with feathers

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