Source : Webster's Revised Unabridged Dictionary (1913)

Butte \Butte\, n. [F. See {Butt} a bound.]
   A detached low mountain, or high rising abruptly from the
   general level of the surrounding plain; -- applied to
   peculiar elevations in the Rocky Mountain region.

         The creek . . . passes by two remarkable buttes of red
         conglomerate.                            --Ruxton.

Source : WordNet®

butte
     n 1: a hill that rises abruptly from the surrounding region; has
          a flat top and sloping sides
     2: a town in southwestern Montana; center for mining copper