Breadcrumb Home > Dictionary > Index E extragalactic nebula: Meaning and Definition of Find definitions for: extragalac'tic neb'ula Pronunciation: [key] (formerly) galaxy (def. 1a). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. extragalactic extrajudicial ✖ Related Content Daily Word Quiz: tatterdemalion Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language