/ Dictionary / Index C check valve: Meaning and Definition of Find definitions for: check' valve" Pronunciation: [key] a valve permitting liquids or gases to flow in one direction only. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. checkup checkweighman Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language