Lanugo means: Lanugo is a downy hair that grows on the baby’s body. Lanugo, the first hair produced by the fetal follicles is usually found on the foetus around 5 months gestation. Lanugo has a soft and fine texture. It is usually not pigmented. Lanugo usually sheds before birth at 7 to 8 months gestation. However, sometimes it can be present at birth. It is normal for lanugo to disappear by itself within days or even weeks.
(in Medical Dictionary)

What else does Lanugo mean?

The covering of soft, fine hair on an insect or leaf.
(in Merlin Dictionary)