/ Dictionary / Index X xyster: Meaning and Definition of Find definitions for: xys•ter Pronunciation: (zis'tur), [key] — n. a surgical instrument for scraping bones. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. xyst xystum Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language