chorionic villus

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 (synset 101475829)
   is a type of: villus - a minute hairlike projection on mucous membrane
   is a part of: chorion - the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)

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