Breadcrumb Home > Dictionary > Index W water gas: Meaning and Definition of Find definitions for: wa'ter gas" Pronunciation: [key] a toxic gaseous mixture consisting chiefly of carbon monoxide and hydrogen, prepared from steam and incandescent coke: used as an illuminant, fuel, and in organic synthesis. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. water gap water gate ✖ Related Content Daily Word Quiz: hieratic Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language