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 (sôk) also Sac (săk, sôk)
n. pl. Sauk or Sauks also Sac or Sacs
1. A member of a Native American people formerly inhabiting parts of Wisconsin, Illinois, and Iowa, with a present-day population mainly in Oklahoma. Sauk resistance to removal from their Illinois lands ended in 1832 with the Black Hawk War.
2. The Algonquian language of the Sauk, dialectally related to Fox.

[North American French saki, from Sauk asaakiiha.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in classic literature ?
The Omahas were once one of the numerous and powerful tribes of the prairies, vying in warlike might and prowess with the Sioux, the Pawnees, the Sauks, the Konsas, and the Iatans.
Black Hawk was a chief with the still-independent Sauks of the upper Mississippi while William Apess began his life with the Pequots of Connecticut, before converting to Methodism and essentially becoming a part of Euro-American Society.
He then explores the complex relationships that existed between groups such as the Sauks and Foxes, Winnebagos, Menominees, and Santee Sioux in the upper Mississippi River basin.