[kuhl-duh-sak, -sak, kool-; French kyduh-sak]
noun, plural culs-de-sac [kuhlz-duh-sak, -sak, koolz-; French kyduh-sak] .
a street, lane, etc., closed at one end; blind alley; dead-end street.
any situation in which further progress is impossible.
the hemming in of a military force on all sides except behind.
Anatomy. a saclike cavity, tube, or the like, open only at one end, as the cecum.

1730–40; < French: literally, bottom of the sack Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cul-de-sac (ˈkʌldəˌsæk, ˈkʊl-)
n , pl culs-de-sac, cul-de-sacs
1.  a road with one end blocked off; dead end
2.  an inescapable position
3.  any tube-shaped bodily cavity or pouch closed at one end, such as the caecum
[C18: from French, literally: bottom of the bag]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1738, as an anatomical term, from Fr., lit. "bottom of a sack," from L. culus "bottom" (for second element, see sack (n.1)). Application to streets and alleys is from 1800.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

cul-de-sac (kŭl'dĭ-sāk', kul'-)
n. pl. culs-de-sac (kŭlz'-, kulz'-) or cul-de-sacs
A saclike cavity or tube open only at one end.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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