/ Dictionary / Index X xyst: Meaning and Definition of Find definitions for: xyst Pronunciation: (zist), [key] — n. (in ancient Greek and Roman architecture) a covered portico, as a promenade. (in an ancient Roman villa) a garden walk planted with trees. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. xylotomous xyster Related Content Daily Word Quiz: philanthropy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language