a plain consisting of adobe deposited by short-lived rainfall or thaw streams, usually having a smooth or unmarked surface.
Origin of adobe flat
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
mainly US a gently sloping clayey plain formed by a short-lived stream or flood water
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012