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(kīyo͞os`), Native North Americans who formerly occupied parts of NE Oregon and SE Washington. They were closely associated with the Nez PercéNez Percé
[Fr.,=pierced nose], Native North Americans whose language belongs to the Sahaptin-Chinook branch of the Penutian linguistic stock (see Native American languages).
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 and spoke a language belonging to the Sahaptin-Chinook branch of the Penutian linguistic stock (see Native American LanguagesNative American languages,
languages of the native peoples of the Western Hemisphere and their descendants. A number of the Native American languages that were spoken at the time of the European arrival in the New World in the late 15th cent.
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). A mission was established (1836) among them by Marcus WhitmanWhitman, Marcus,
1802–47, American pioneer and missionary in the Oregon country, b. Federal Hollow (later Rushville), N.Y. In 1836 he left a country medical practice to go West as a missionary for the joint Presbyterian-Congregationalist board.
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 at Waiilatpu. In 1847 the Cayuse, blaming the missionaries for an outbreak of smallpox, attacked the mission and killed the Whitmans and their helpers. The settlers then declared war and defeated the Cayuse. In 1855 they were placed on the Umatilla Reservation in Oregon, which they continue to share with the Wallawalla and Umatilla peoples; by 1990 they were among the smallest groups of Native Americans, numbering 126. A small horse bred by them gave the name cayuse to all Native American horses (see mustangmustang
[Sp. mesteño=a stray], small feral horse of the W United States. Mustangs are descended from escaped Native American horses, which in turn were descended from horses of North African blood, brought to the New World by the Spanish c.1500.
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See R. H. Ruby and J. A. Brown, The Cayuse Indians (1972).

References in periodicals archive ?
The OH-6A Cayuse entered service in September 1966 and established 23 world records for speed, distance and altitude.
Rebel came home from the Cayuse with some halter training and trailer loading; but he didn't know me and we got off to a rough, bratty start.
Cayuse is dedicated to understanding industry best practices of the various aspects of research administration, from grant proposal development to commercialization.
The OH-6 Cayuse has been recognized as an icon of the Army s rotary wing fleet for nearly 50 years," said MD Helicopters~ chief executive officer Lynn Tilton, "From its ability to perform fast, difficult maneuvers in compact space, to its unmatched safety record, the MD 530F is a mission proven performer in its own right.
The plot hinges on the rivalry between Governor Stevens and the proud, fierce Yakima Chief Kamiaka, who rallies nearly 2,000 Yakima, Cayuse and other warriors to kill or drive the whites out of their hunting grounds.
Their reputation for customer support and their experience in the industry makes Cayuse the ideal company to help UNC deploy and support RAMSeS commercially.
Hector's Cayuse kick up his heels and throw the doctor over a precipice.
Several hundred feet of the highway have washed out south of Cayuse Pass.
Despite the challenging economic climate and reduced university budgets, Cayuse, Inc.
Obsidians: Tom Musselwhite leads a 9-mile trek to Cayuse Creek.
Finally, with the aid of the hotel proprietor, we got an Indian cayuse from some Indians and rustled an old buckboard and an old set of harness, both of which we had to repair.