chorion
Embryological term for the outermost fetal membrane in mammals, birds, and reptiles.
The chorion is involved in the formation of the placenta.
chorioamnionitis; intra-amniotic infection
From 絨毛 (じゅうもう, 'villus') + 膜 (まく, 'membrane'). The term is a direct translation of the Western medical concept 'chorion'.