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The Collaborative International Dictionary
Lanugo

Lanugo \La*nu"go\, n. [See Lanuginose.] (Anat.) The soft woolly hair which covers most parts of the mammal fetus, and in man is shed before or soon after birth.

Wiktionary
lanugo

n. Soft down or fine hair, specifically that covering the human foetus or a tumorous area

WordNet
lanugo

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

Wikipedia
Lanugo

Lanugo (; from Latin lana "wool") is very thin, soft, usually unpigmented, downy hair that is sometimes found on the body of a fetus or newborn baby. It is the first hair to be produced by the fetal hair follicles, and it usually appears around 16 weeks of gestation and is abundant by week 20. It is normally shed before birth, around seven or eight months of gestation, but is sometimes present at birth. It disappears on its own within a few weeks.

It is replaced by hair covering the same surfaces, which is called vellus hair. This hair is thinner and more difficult to see. The more visible hair that persists into adulthood is called terminal hair. It forms in specific areas and is hormone-dependent.

Usage examples of "lanugo".

This dog-faced congenital anomaly, almost every inch of his face, his body covered with long lanugo hair, pale baby-fine hair?