Cul-de-sac /(ku`de-s?k" [or] kul`de-s?k")/

pl. Culs-de-sac ((ku`- [or] kulz`-))

1. A passage with only one outlet, as a street closed at one end; a blind alley; hence, a trap.
2. a position in which an army finds itself with no way of exit but to the front. (Mil.)
3. Any bag-shaped or tubular cavity, vessel, or organ, open only at one end. (Anat.)