/ Dictionary / Index E exonarthex: Meaning and Definition of Find definitions for: ex•o•nar•thex Pronunciation: (ek"sō-när'theks), [key] — n. a covered walk, vestibule, or narthex situated before a narthex; an outer narthex. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. exon exonerate Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language