/ 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: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language