from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a large plateau to the south and west of the Rocky Mountains; abuts mountains on the north and east and ends in an escarpment overlooking lowlands to the south and west; the Grand Canyon is carved out of the southwestern corner
Sorry, no etymologies found.
This area of Arizona, she knew from teaching geography, was part of the Colorado Plateau - a series of flat plateaus, her book described it, broken by a few mountains and canyons.