Eiderdown (noun)

1. A type of soft, warm, and lightweight down used as filling for bedding and clothing.
2. A type of quilt or comforter filled with eiderdown.

Origin:

From the old norse word "éðr" meaning "eider duck" + "dun" meaning "down".

Examples:

1. She wrapped herself in the eiderdown for extra warmth on the cold winter night.
2. He had an eiderdown comforter on his bed that kept him warm all night.
3. The eiderdown jacket was perfect for the winter weather.
4. An eiderdown quilt is a luxurious and warm bedding option.
5. Eiderdown is considered one of the most luxurious and warm materials for bedding and clothing.