/ Dictionary / Index S slide valve: Meaning and Definition of Find definitions for: slide' valve" Pronunciation: [key] — Mach. Mach. a valve that slides without lifting to open or close an aperture, as the valves of the ports in the cylinders of certain steam engines. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. slide trombone slideway Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language