絨じゅう毛もう膜まくMeanings1nounchorionembryologyEmbryological term for the outermost fetal membrane in mammals, birds, and reptiles.絨じゅう毛もう膜まくは胎たい盤ばんの形けい成せいに関かん与よする。The chorion is involved in the formation of the placenta.