Breadcrumb Home > Dictionary > Index X XS: Meaning and Definition of Find definitions for: XS Pronunciation: [key] extra small. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. x-ray tube x-stretcher ✖ Related Content Daily Word Quiz: tatterdemalion Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language