lanugo

A covering of fine, soft hair, as on a leaf, insect, or newborn child.

In anatomy, the coat of delicate downy hairs with which the human fetus is covered for some time before birth.

In botany and zoology, the cottony or woolly growth on the surface of some leaves, fruits, insects, etc.

The soft woolly hair which covers most parts of the mammal fetus, and in man is shed before or soon after birth.

The soft down or fine hair, specifically as covering the human foetus or a tumorous area

the fine downy hair covering a human fetus; normally shed during the ninth month of gestation