2. Noun. A circular area at the end of a dead end street to allow cars to turn around, designed so children can play on the street, with little or no through-traffic. ¹
3. Noun. An impasse. ¹
4. Noun. (medicine) A sack-like cavity or tube open at one end only. ¹
¹ Source: wiktionary.com
Medical Definition of Cul-de-sac
1. 1. A blind pouch or tubular cavity closed at one end; e.g., diverticulum; caecum. Synonym: rectouterine pouch. Origin: Fr. Bottom of a sack (05 Mar 2000)