The Collaborative International Dictionary of English v.0.48:

Cul-de-sac \Cul`-de-sac"\ (ku`de-s?k" or kul`de-s?k"), n.; pl.
   Culs-de-sac (ku`- or kulz`-). [ F., lit., bottom of a bag.]
   [1913 Webster]
   1. A passage with only one outlet, as a street closed at one
      end; a blind alley; hence, a trap.
      [1913 Webster]

   2. (Mil.) a position in which an army finds itself with no
      way of exit but to the front.
      [1913 Webster]

   3. (Anat.) Any bag-shaped or tubular cavity, vessel, or
      organ, open only at one end.
      [1913 Webster]

U.S. Gazetteer Places (2000):

Culdesac, ID -- U.S. city in Idaho
   Population (2000):    378
   Housing Units (2000): 171
   Land area (2000):     0.236038 sq. miles (0.611335 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.236038 sq. miles (0.611335 sq. km)
   FIPS code:            19900
   Located within:       Idaho (ID), FIPS 16
   Location:             46.374883 N, 116.670333 W
   ZIP Codes (1990):     83524
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Culdesac, ID
    Culdesac