/ Dictionary / Index R roentgenotherapy: Meaning and Definition of Find definitions for: roent•gen•o•ther•a•py Pronunciation: (rent"gu-nō-ther'u-pē, -ju-, runt"-), [key] — n. treatment of disease by means of x-rays. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. roentgenoscope Roentgen ray Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language