/ Dictionary / Index P prop wash: Meaning and Definition of Find definitions for: prop' wash" Pronunciation: [key] — Informal. Informal. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. propulsion propyl 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