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Meaning of radio source

ra'dio source"

Pronunciation: [key]
— Astron. Astron.
  1. a cosmic object or phenomenon, as a galaxy, pulsar, quasar, or the remnant of a supernova or of a galactic collision, that emits radio waves.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.