/ Dictionary / Index C cathode ray: Meaning and Definition of Find definitions for: cath'ode ray" Pronunciation: [key] a flow of electrons emanating from a cathode in a vacuum tube and focused into a narrow beam. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cathode glow cathode-ray tube Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language