The Collaborative International Dictionary of English v.0.48:

Comanches \Co*man"ches\ (? or ?), n. pl.; sing. Comanche (? or
   ?). (Ethnol.)
   A warlike, savage, and nomadic tribe of the Shoshone family
   of Indians, inhabiting Mexico and the adjacent parts of the
   United States; -- called also Paducahs. They are noted for
   plundering and cruelty.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Comanche
    n 1: a member of the Shoshonean people who formerly lived
         between Wyoming and the Mexican border but are now chiefly
         in Oklahoma
    2: the Shoshonean language spoken by the Comanche