eiderdown

/ˈaɪdərˌdaʊn/
noun
  1. A soft, thick quilt or comforter filled with the soft feathers (down) of the eider duck, used on a bed for warmth.
    • He pulled the eiderdown up to his chin and fell asleep instantly.
    • She snuggled under the warm eiderdown on the cold winter night.
    • The hotel room had a fluffy white eiderdown on the bed.
  2. The soft, fine feathers of the eider duck, used as filling for quilts, pillows, and clothing.
    • The pillow was stuffed with pure eiderdown, making it incredibly soft.
    • They collected eiderdown from the nests to make warm jackets.
    • Eiderdown is highly valued for its lightness and insulating properties.
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