/ Dictionary / Index R radioautograph: Meaning and Definition of Find definitions for: ra•di•o•au•to•graph Pronunciation: (rā"dē-ō-ô'tu-graf", -gräf"), [key] — n. autoradiograph. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. radio astronomy radioautography Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language