/ Dictionary / Index X xenolith: Meaning and Definition of Find definitions for: xen•o•lith Pronunciation: (zen'l-ith), [key] — n. Petrog. a rock fragment foreign to the igneous rock in which it is embedded. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: xenolith (Thesaurus) xenograft xenomorphic Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language