/ Dictionary / Index S syngas: Meaning and Definition of Find definitions for: syn•gas Pronunciation: (sin'gas"), [key] — n. synthetic natural gas. See under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. syngamy Synge Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language