Cheyenne

Concise Oxford English Dictionary © 2008 Oxford University Press:
Cheyenne /ʃʌɪˈan/

▶noun (pl. same or Cheyennes)

• 1 a member of an American Indian people formerly living between the Missouri and Arkansas Rivers.

• 2 the Algonquian language of the Cheyenne.

– origin Canad. Fr., from Dakota šahíyena, from šaia ‘speak incoherently’.