/ Dictionary / Index X xystus: Meaning and Definition of Find definitions for: xys•tus Pronunciation: (zis'tus), [key] — pl. -ti xyst. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. xystum Xystus I Related Content Daily Word Quiz: quandary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language