/ Dictionary / Index G gas tube: Meaning and Definition of Find definitions for: gas' tube" Pronunciation: [key] an electron tube the envelope of which contains a highly rarefied gas. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gastrulation gas turbine Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language