/ Dictionary / Index R radium emanation: Meaning and Definition of Find definitions for: ra'dium emana"tion Pronunciation: [key] — Chem. Chem. (formerly) radon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. radium B radium F 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