名詞 lanugo:

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

la.nu.go

n.（名詞）
【復數(shù)】 la.nu.gos
A covering of fine, soft hair, as on a leaf, an insect, or a newborn child.
細毛：，柔毛，例如覆蓋在葉子、昆蟲或嬰兒的身上的細而軟的毛

來源：
Middle English [pith]
中古英語 [髓]
from Latin l3nôgô [down]
源自 拉丁語 l3nôgô [下]
from lana [wool]
源自 lana [羊毛]