lanugo

名词 lanugo:

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

la.nu.go

n.（名词）
【复数】 la.nu.gos
A covering of fine, soft hair, as on a leaf, an insect, or a newborn child.
细毛：，柔毛，例如覆盖在叶子、昆虫或婴儿的身上的细而软的毛

来源：
Middle English [pith]
中古英语 [髓]
from Latin l3nôgô [down]
源自 拉丁语 l3nôgô [下]
from lana [wool]
源自 lana [羊毛]