In anatomy, a blind pouch or hole that's closed at one end. The expression cul-de-sac can be used especially to refer to the rectouterine pouch (the pouch of Douglas), an extension for the peritoneal cavity between the rectum and straight back wall of the uterus.
1738, as an anatomical term, from French cul-de-sac, virtually "bottom of a sack," from Latin culus "bottom, backside, fundament." For second factor, see sack (n.1). Application to roads and alleys is from 1800.
A passage with only 1 socket, as a street closed at one end; a blind alley; therefore, a trap.
- a situation where an army discovers it self without any means of exit but to your front.
- Any bag-shaped or tubular cavity, vessel, or organ, open just at one end.
Great waves of extinction have followed the long periods of the slow evolution of relatively inadaptive types of tooth and foot structure, as first demonstrated by Waldemar Kowalevsky; thus mammals are repeatedly observed in a cul-de-sac of structure from which there is no escape in an adaptive direction.