Sioux

American  

[soo] / su /

noun

1. Dakota.

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Sioux British  

/ suː /

noun

1. a member of a group of North American Indian peoples formerly ranging over a wide area of the Plains from Lake Michigan to the Rocky Mountains

2. any of the Siouan languages

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Sioux Cultural  

1. A common name for the Dakota people, a tribe of Native Americans inhabiting the northern Great Plains in the nineteenth century. They were famed as warriors and frequently took up arms in the late nineteenth century to oppose the settlement of their hunting grounds and sacred places. In 1876, Sioux warriors, led by Chief Sitting Bull, and commanded in the field by Chief Crazy Horse, overwhelmed the United States cavalry at the Battle of the Little Bighorn. (See Custer's last stand.) A group of Sioux under Chief Big Foot were massacred by United States troops at Wounded Knee in 1890.

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Etymology

Origin of Sioux

An Americanism dating back to 1755–65; from North American French, shortening of earlier Nadouessioux from Ojibwe (Ottawa dialect) na·towe·ssiw(ak) (plural), from unattested Proto-Algonquian na·towe·hsiw-, derivative of unattested na·towe·wa ”Iroquoian,” probably literally, “speaker of a foreign language”) + French -x plural marker

Example Sentences

At the heart of the North Dakota court battle was the Dakota Access Pipeline, where from 2016 to 2017 the Standing Rock Sioux Tribe led one of the largest anti-fossil-fuel protests in US history.

From Barron's • Feb. 27, 2026

Virginia-based Smithfield said it will spend about $1.3 billion over three years on a new facility in Sioux Falls, S.D.

From The Wall Street Journal • Feb. 16, 2026

Guardians Grow founder Sioux Watkins said the supermarket also aimed to help users "make sure you are getting the support you need from other services".

From BBC • Feb. 5, 2026

The company that had been based in Palo Alto is now based in Sioux Falls, S.D., according to a December filing to the U.S.

From Los Angeles Times • Jan. 21, 2026

Cavalry soldiers, ninety-seven Cheyenne, Kiowa, Pawnee, and Sioux Indians, another fifty Cossacks and Hussars, 180 horses, eighteen buffalo, ten elk, ten mules, and a dozen other animals.

From "The Devil in the White City" by Erik Larson