/ Dictionary / Index G gaseous diffusion: Meaning and Definition of Find definitions for: gas'eous diffu'sion Pronunciation: [key] — Chem. Chem. the passage of gas through microporous barriers, a technique used for isotope separation, esp. in the preparation of fuel for nuclear reactors. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gaseous gas field Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language