/ Dictionary / Index X xerarch: Meaning and Definition of Find definitions for: xe•rarch Pronunciation: (zēr'ärk), [key] — adj. Ecol. (of a sere) originating in a dry habitat. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Xenophon Xeres Related Content Daily Word Quiz: reticent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language