RhymeZone: cul-de-sac definitions

Definitions of cul-de-sac:

noun: A blind alley or dead end street.
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.
noun: An impasse.
noun: (medicine) A sack-like cavity, a tube open at one end only.

(Definitions from Wiktionary)