/ Dictionary / Index C combustion tube: Meaning and Definition of Find definitions for: combus'tion tube" Pronunciation: [key] a tube of hard glass used esp. in a furnace for burning a substance in a current of air or oxygen. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. combustion engine combustor Related Content Daily Word Quiz: sumptuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language