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

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.


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    chorioretinitis cho·ri·o·ret·i·ni·tis (kôr’ē-ō-rět’n-ī’tĭs) n. Inflammation of the choroid and retina. Also called choroidoretinitis, retinochoroiditis.

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