/ Dictionary / Index N noble gas: Meaning and Definition of Find definitions for: no'ble gas' Pronunciation: [key] — Chem. Chem. any of the chemically inert gaseous elements of group 8A or 0 of the periodic table: helium, neon, argon, krypton, xenon, and radon. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. noble fir nobleman Related Content Daily Word Quiz: dormant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language