Geology. a broad, sloping landform built of coalesced deposits of outwash.
These Plain Words Have Very Odd Origin StoriesOver the years, these words have gone on a journey from signifying creepy, strange, antithetical, and even paranormal ideas to taking on the standard meanings we know and understand today.
Origin of outwash plain
First recorded in 1930–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019