★
noun.
1. soft feathers.
△Ex. a pillow made of down, the down of a young bird.
2. soft hair or fluff.
△Ex. The down on a boy's chin develops into a beard.
3. (Botany.)
a. a fine, soft hair on some plants and fruits.
△Ex. peach down.
b. the soft, feathery pappus of some seeds, as in the dandelion and thistle.