/ Dictionary / Index P Perseus cluster: Meaning and Definition of Find definitions for: Per'seus clus"ter Pronunciation: [key] — Astron. Astron. a cluster of about 500 galaxies in the direction of the constellation Perseus, grouped around a particular Seyfert galaxy that is an intense radio source Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Perseus perseverance Related Content Daily Word Quiz: blanch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language