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Related to cayuse: Cayuse Indian pony
n. pl. Cayuse or Cay·us·es
1. A member of a Native American people inhabiting northeast Oregon and southeast Washington.
a. The extinct traditional language of the Cayuse, not closely related to any other.
b. The dialect of Nez Perce spoken by the Cayuse in the 1800s and 1900s.
[From Columbian Salish (Salish language of the Columbia River valley) qayús, Cayuse or a kindred word in another language of the Pacific Northwest .]
n. Pacific Northwest
A small sturdy horse, especially a Cayuse Indian pony.
[Short for cayuse pony, from Cayuse.]
(Animals) Western US and Canadian a small Native American pony used by cowboys
[C19: from a Chinookan language]
cay•use(kaɪˈyus, ˈkaɪ us)
Western U.S. a horse, esp. an Indian pony.
[1830–40; Cayuse, American Indian people of Oregon]