Webster’s Revised Unabridged Dictionary · 1913
Butte
Butte (būt or bo͝ot), 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.