/ Dictionary / Index R radiogenic: Meaning and Definition of Find definitions for: ra•di•o•gen•ic Pronunciation: (r?"d?-?-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: abscond Analogy of the Day: Today?s Analogy Spelling Bee: Today?s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language