Breadcrumb Home > Dictionary > Index X Xystus III: Meaning and Definition of Find definitions for: Xystus III. Pronunciation: [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Xystus II Y, y ✖ Related Content Daily Word Quiz: tendentious Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language