lanugo

lānūgō īnis, f

lana, woolly substance, down : flavens primā lanugine malas, V.: dubia, O.: tenera, V.

lanugo
lānūgo, ĭnis, f. [cf. Gr. λάχνη, Lat. lāna], woolly substance, down, of plants, of the cheeks, etc. ...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
Lanugo
·noun The soft woolly hair which covers most parts of the mammal fetus, and in man is shed before or...

Webster's Dictionary of the English Language