(anatomy, biology) The protective and nutritive membrane in higher vertebrates that attaches the fetus to the uterus. / (biology, entomology) The outer case of an insect egg.

Of or pertaining to the chorion.

plural of chorion

Inflammation of the chorion.

That retain a chorion

The chorionic status of multiple pregnancies: whether twins in utero share one chorion and placenta (monochorionic) or whether they each have their own (dichorionic).

(nonstandard) Chorionicity.

Synonym of choriogenesis

A hormone secreted by the chorion of the placenta. Its role is to maintain the corpus luteum.

plural of chorionic gonadotropin