/ Dictionary / Index N negative glow: Meaning and Definition of Find definitions for: neg'ative glow' Pronunciation: [key] — Physics. Physics. the luminous region between the Crookes dark space and the Faraday dark space in a vacuum tube, occurring when the pressure is low. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. negative flag negative income Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language