/ Dictionary / Index V valve stem: Meaning and Definition of Find definitions for: valve' stem" Pronunciation: [key] stem (def. 14). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. valve lifter valve trombone Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language