chorionic villus

English Thesaurus

1. one of the tiny villi that stick out of the fetal chorion and combine with the mother's uterine tissue to form the placenta (noun.animal)

hypernym	:	villus,
definition	:	a minute hairlike projection on mucous membrane (noun.animal)

part meronym	:	chorion,
definition	:	the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals) (noun.animal)