the fine downy hair covering a human fetus; normally shed during the ninth month of gestation
例句
Fetal squames, lanugo hair, vernix, and mucin can embolize to small pulmonary arteries. 胎儿的鳞状上皮、胎毛、胎脂和粘液可栓塞到肺内小动脉。
Results indicate that the development of lanugo expresses temporal and spatial sequence, namely, hair occurs from head to tail. 不同部位胎毛密度从大到小依次为：臀部＞颈部＞背部＞腹部＞后肢上部；
The function differentiation of lanugo morphology for different parts of the fetus makes preparations for protecting abdomen and limb and preventing mechanical damage effectively after birth. 不同部位之间胎毛形态出现的功能分化，为狍出生后加强对身体的保温和对抗机械损伤做了相应准备。
Relationship between Structure and Function of Lanugo in Roe Deer 狍胎毛形态结构与功能的关系
20 weeks. Approximately 20cm. Woolly hair, known as lanugo, covers the entire head 第二十周，胎儿体长大约20厘米，胎毛布满整个头部。
"Babies shed a layer of downy, slender hairs (lanugo) before or just after birth. The fine. short, unpigmented hairs (vellus) then grow." 胎毛是一层绒毛状的细毛，在出生前或出生后不久便脱落。后来婴儿身上长出短而纤细的毫毛。
