Breadcrumb Home > Dictionary > Index X x-ray burster: Meaning and Definition of Find definitions for: x'-ray burst"er Pronunciation: [key] — Astron. Astron. a celestial source from which bursts of x-rays are received. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. x-ray astronomy x-ray crystallography ✖ Related Content Daily Word Quiz: tendentious Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language