/ Dictionary / Index R radiophosphorus: Meaning and Definition of Find definitions for: ra•di•o•phos•pho•rus Pronunciation: (rā"dē-ō-fos'fur-us), [key] — n. Chem. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. radiophone radiophotograph Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language