/ Dictionary / Index Q QSO: Meaning and Definition of Find definitions for: QSO Pronunciation: [key] — Astron. Astron. quasi-stellar object. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Q-ship QSS Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language