/ Dictionary / Index R radio beam: Meaning and Definition of Find definitions for: ra'dio beam" Pronunciation: [key] beam (def. 12). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. radio beacon radiobiology Related Content Daily Word Quiz: modify Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language