Source : Webster's Revised Unabridged Dictionary (1913)

Yuman \Yu"man\, a.
   Designating, or pertaining to, an important linguistic stock
   of North American Indians of the southwestern United States
   and northwestern Mexico, nearly all agriculturists and adept
   potters and basket makers. Their usual dwelling is the brush
   wikiup, and in their native state they wear little clothing.
   The Yuma, Maricopa, Mohave, Walapi, and Yavapai are among the
   chief tribes, all of fine physique.

Source : WordNet®

Yuman
     n : a group of language of the Hokan family in Arizona and
         California and Mexico