Pronunciation: (ī'dur-doun"),[key] —n. 1. down, or soft feathers, from the breast of the female eider duck.
2. a heavy quilt or comforter, esp. one filled with eiderdown.
3. a warm, lightweight knitted or woven fabric of wool, cotton, or man-made fibers, napped on one or both sides, used for sleepwear, infants' clothing, etc.