chorion
noun(cho-ri-on)
the highly vascular outer embryonic membrane of reptiles, birds, and mammals that in placental mammals is associated with the allantois in the formation of the placenta
chorion
adjective(cho-ri-on)
of, relating to, or being part of the chorion
chorion
adjective(cho-ri-on)
secreted or produced by chorionic or related tissue (as in the placenta or a choriocarcinoma)