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