Breadcrumb Home > Dictionary > Index X x-radiation: Meaning and Definition of Find definitions for: x-ra•di•a•tion Pronunciation: (eks'rā"dē-ā'shun), [key] — n. exposure to x-rays. radiation in the form of x-rays. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: x-radiation (Thesaurus) xr X-rated ✖ Related Content Daily Word Quiz: tendentious Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language