chorionic villus

chorionic-villus的词性：
n.（名词）

1. One of the minute vascular projections of the fetal chorion that combines with maternal uterine tissue to form the placenta.
绒毛膜绒毛：是一种具有微血管的胎膜的突出物，由母亲的子宫组织组成，用以形成胎盘