/ Dictionary / Index S supergalaxy: Meaning and Definition of Find definitions for: su•per•gal•ax•y Pronunciation: (s'pur-gal"uk-sē), [key] — pl. -ax•ies. a system of galaxies. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. superfuse supergene Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language