[ soo-uhn ]

  1. an American Indian language family formerly widespread from Saskatchewan to the lower Mississippi, also found in the Virginia and Carolina piedmont, and including Catawba, Crow, Dakota, Hidatsa, Mandan, Osage, and Winnebago.

  2. a member of one of the Siouan-speaking peoples.

  1. of or relating to the Sioux or the Siouan languages.

Origin of Siouan

An Americanism dating back to 1885–90; Sioux + -an

Words Nearby Siouan Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use Siouan in a sentence

British Dictionary definitions for Siouan


/ (ˈsuːən) /

  1. a family of North American Indian languages including Sioux, probably related to Iroquoian

  1. of or relating to the Sioux peoples or languages

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012