Peritoneal space or pouch formed between the rectum and the uterus in the female human body.
In humans, the pouch of Douglas is the female counterpart of the rectovesical excavation in males. This space is used in end-stage renal failure dialysis where the tip of the catheter is placed.
Word origin: named after the Scottish anatomist Dr James Douglas who extensively explored this region of the female body.
Compare: rectovesical excavation.