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Extrait du Merriam-Webster :

Main Entry: cul-de-sac
Pronunciation: 'k&l-di-"sak, 'kul-; "k&l-di-', "kul-
Function: noun
Inflected Form(s): plural culs-de-sac  /'k&l(z)-, 'kul(z)-, "k&l(z)-, "kul(z)-/; also cul-de-sacs  /-"saks, -'saks/
Etymology: French, literally, bottom of the bag
1 : a blind diverticulum or pouch
2 : a street or passage closed at one end