D defs.my
Entry 3 senses Webster, 1913

Cul-de-sac

/(ku`de-s?k" [or] kul`de-s?k")/ · Cul·-de-sac · IPA /ˈkʌldəsæk/
01 n. A passage with only one outlet, as a street closed at one end; a blind alley; hence, a trap.
pl. Culs-de-sac ((ku`- [or] kulz`-))
  1. 1.
    A passage with only one outlet, as a street closed at one end; a blind alley; hence, a trap.
  2. 2.
    a position in which an army finds itself with no way of exit but to the front.(Mil.)
  3. 3.
    Any bag-shaped or tubular cavity, vessel, or organ, open only at one end.(Anat.)