/ Dictionary / Index X xeno-: Meaning and Definition of Find definitions for: xeno- Pronunciation: [key] a combining form meaning “alien,” “strange,” “guest,” used in the formation of compound words: xenogamy, xenolith. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. xenic acid xenobiotic Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language