/ Dictionary / Index R radium F: Meaning and Definition of Find definitions for: radium F Pronunciation: [key] — Chem. Chem. an isotope of polonium: polonium 210. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. radium emanation radium sulfate Related Content Daily Word Quiz: entomology Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language