chorionic villus

noun Embryology.
one of the branching outgrowths of the chorion that, together with maternal tissue, form the placenta.
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American Heritage
Medical Dictionary

chorionic villus n.
Any of the various fingerlike projections of the chorion of the embryo that contain fetal blood vessels and grow into the intervillous lacuna of the placenta.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Chorionic villus sampling can also test for the possibility.
Suzy decided to undergo a common prenatal test called chorionic villus sampling.
Diagnosis is made in the first trimester by chorionic villus sampling.
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