DoctorWhitey - Cul-de-sac: In anatomy, a blind pouch or cavity that is closed at one end. The term cul-de-sac is used specifically to refer to the rectouterine pouch (the pouch of Douglas),
Centre Liégeois d'Endométriose « Qu'est-ce que c'est ?
What does it mean when there is a free pouch of Douglas? - Quora