noun
a warm, lightweight quilt or comforter filled with the down of the eider duck
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The hotel room was adorned with a luxurious eiderdown on the bed.
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I love snuggling up with my eiderdown on cold nights.
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That eiderdown is so fluffy, it's like sleeping on a cloud.
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Her words wrapped around me like a warm eiderdown, comforting and soothing.