soft, fine, fluffy feathers which form the first covering of a young bird or an insulating layer below the contour feathers of an adult bird:the baby penguins' woolly down is essential in the Antarctic winter
down feathers taken from ducks or their nests and used for stuffing cushions, quilts, etc.:a down-filled sleeping bag
fine, soft hair on the face or body of a person:the little girl had a covering of golden down on her head
short, soft hairs on some leaves, fruit, or seeds:the bright green leaves are covered with a soft white down
