Relating to the chorion.
* * *
cho·ri·on·ic .kōr-ē-'än-ik, .kȯr- adj
1) of, relating to, or being part of the chorion <\chorionic villi>
2) secreted or produced by chorionic or a related tissue (as in the placenta or a choriocarcinoma) <human \chorionic gonadotropin>
Medical dictionary. 2011.