1. 
[syn: Sioux, Siouan]
The Collaborative International Dictionary of English v.0.48:
Sioux \Sioux\, prop. n. sing. & pl. (Ethnol.)
   A nation of American Indians; see Dakotas.
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Dakotas \Da*ko"tas\, n. pl.; sing. Dacota. (Ethnol.)
   An extensive race or stock of Indians, including many tribes,
   mostly dwelling west of the Mississippi River; -- also, in
   part, called Sioux. [Written also Dacotahs.]
   [1913 Webster]
WordNet (r) 3.0 (2006):
Sioux
    n 1: a member of a group of North American Indian peoples who
         spoke a Siouan language and who ranged from Lake Michigan
         to the Rocky Mountains [syn: Sioux, Siouan]
U.S. Gazetteer Counties (2000):
Sioux -- U.S. County in Iowa
   Population (2000):    31589
   Housing Units (2000): 11260
   Land area (2000):     767.883314 sq. miles (1988.808569 sq. km)
   Water area (2000):    0.699272 sq. miles (1.811107 sq. km)
   Total area (2000):    768.582586 sq. miles (1990.619676 sq. km)
   Located within:       Iowa (IA), FIPS 19
   Location:             43.075135 N, 96.182305 W
   Headwords:
    Sioux
    Sioux, IA
    Sioux County
    Sioux County, IA
U.S. Gazetteer Counties (2000):
Sioux -- U.S. County in Nebraska
   Population (2000):    1475
   Housing Units (2000): 780
   Land area (2000):     2066.588747 sq. miles (5352.440055 sq. km)
   Water area (2000):    0.727944 sq. miles (1.885367 sq. km)
   Total area (2000):    2067.316691 sq. miles (5354.325422 sq. km)
   Located within:       Nebraska (NE), FIPS 31
   Location:             42.432082 N, 103.792840 W
   Headwords:
    Sioux
    Sioux, NE
    Sioux County
    Sioux County, NE
U.S. Gazetteer Counties (2000):
Sioux -- U.S. County in North Dakota
   Population (2000):    4044
   Housing Units (2000): 1216
   Land area (2000):     1094.120067 sq. miles (2833.757845 sq. km)
   Water area (2000):    34.178616 sq. miles (88.522205 sq. km)
   Total area (2000):    1128.298683 sq. miles (2922.280050 sq. km)
   Located within:       North Dakota (ND), FIPS 38
   Location:             46.135844 N, 100.867173 W
   Headwords:
    Sioux
    Sioux, ND
    Sioux County
    Sioux County, ND