(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.