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From The Collaborative International Dictionary of English v.0.48:
Yumas \Yu"mas\, n. pl.; sing. Yuma. (Ethnol.) A tribe of Indians native of Arizona and the adjacent parts of Mexico and California. They are agricultural, and cultivate corn, wheat, barley, melons, etc. [1913 Webster] Note: The a wider sense, the term sometimes includes the Mohaves and other allied tribes. [1913 Webster]