/ Dictionary / Index R radiocesium: Meaning and Definition of Find definitions for: ra•di•o•ce•si•um Pronunciation: (rā"dē-ō-sē'zē-um), [key] — n. Chem. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. radiocast radiochemical Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language