Definitions for chorionic villi
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Chorionic villi are villi that sprout from the chorion in order to give a maximum area of contact with the maternal blood. They are the sine qua non of pregnancy, from a histomorphologic perspective, and are by definition products of conception. Embryonic blood is carried to the villi by the branches of the umbilical arteries, and after circulating through the capillaries of the villi, is returned to the embryo by the umbilical veins. Thus, the villi are part of the border between maternal and fetal blood during pregnancy.
U.S. National Library of Medicine
The threadlike, vascular projections of the chorion. Chorionic villi may be free or embedded within the DECIDUA forming the site for exchange of substances between fetal and maternal blood (PLACENTA).
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"chorionic villi." Definitions.net. STANDS4 LLC, 2016. Web. 9 Feb. 2016. <http://www.definitions.net/definition/chorionic villi>.