radio source: Meaning and Definition of

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.