Pronunciation: (kul'du-sak', -sak", kool'-; Fr. kydu-sak'),[key] —n., —pl.culs-de-sacPronunciation: (kulz'du-sak', -sak", koolz'-; Fr. kydu-sak').[key] 1. a street, lane, etc., closed at one end; blind alley; dead-end street.
2. any situation in which further progress is impossible.
3. the hemming in of a military force on all sides except behind.
4. Anat.a saclike cavity, tube, or the like, open only at one end, as the cecum.