One of the minute vascular projections of the fetal chorion that combines with maternal uterine tissue to form the placenta.
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chorionicvillus sampling — chorionic villus sampling n. Abbr. CVS A prenatal test to detect birth defects that is performed at an early stage of pregnancy and involves retrieval and examination of tissue from the chorionic villi. Also called chorionic villus biopsy. * * * … Universalium