Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
Any of the minute fingerlike projections of the fetal chorion that contain fetal blood vessels and that combine with maternal uterine tissue to form the placenta.
one of the branching outgrowths of the chorion that together with maternal tissue form the placenta.
Switch to new thesaurus
|Noun||1.||chorionic villus - one of the tiny villi that stick out of the fetal chorion and combine with the mother's uterine tissue to form the placenta|
chorion - the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)
villus - a minute hairlike projection on mucous membrane