/ Dictionary / Index R radiogenic: Meaning and Definition of Find definitions for: ra•di•o•gen•ic Pronunciation: (rā"dē-ō-jen'ik), [key] — adj. produced by radioactive decay: radiogenic lead; radiogenic heat. having qualities or characteristics that broadcast well; suitable for presentation on the radio. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. radio galaxy radiogram Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language