/ Dictionary / Index E external galaxy: Meaning and Definition of Find definitions for: exter'nal gal'axy Pronunciation: [key] — Astron. Astron. any galaxy other than the Milky Way. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. external ear external hemorrhoid Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language