/ Dictionary / Index C Cygnus A: Meaning and Definition of Find definitions for: Cygnus A Pronunciation: [key] — Astron. Astron. a strong radio source in the constellation Cygnus associated with a distant peculiar galaxy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Cygnus Cygnus X-1 Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language