Breadcrumb Home > Thesaurus > S Synonyms of sioux Find synonyms for: Noun 1. Sioux, Siouan, Plains Indian, Buffalo Indian usage: 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 WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of sioux (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: quisling Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language