/ Dictionary / Index O outwash: Meaning and Definition of Find definitions for: out•wash Pronunciation: (out'wosh", -wôsh"), [key] — n. Geol. the material, chiefly sand or gravel, deposited by meltwater streams in front of a glacier. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. outwardly outwash plain Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language