The word "chorionic" refers to something related to the chorion, which is a membrane that surrounds and supports a developing embryo or fetus in the womb. Full definition
If your doctor suspects that you have a retained placenta, she will probably perform a physical examination, check your blood for levels of human chorionic gonadotropin (HCG), and do an ultrasound to look for pieces of the placenta left behind in your uterus. (verywellfamily.com)
Interestingly, scientists are now linking a hormone called human chorionic gonadotropin with morning sickness, and note that baby girls produce more than baby boys. (surrogateparenting.com)
He pioneered the development of chorionic villus sampling (CVS) and multi-fetal reduction. (agbt.org)