radio source

noun Astronomy.
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.

Origin:
1945–50

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World English Dictionary
radio source
 
n
a celestial object, such as a supernova remnant or quasar, that is a source of radio waves

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

radio source

in astronomy, any of various objects in the universe that emit relatively large amounts of radio waves. Nearly all types of astronomical objects give off some radio radiation, but the strongest sources of such emissions include pulsars, certain nebulas, quasars, and radio galaxies.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The distance between a terrestrial receiver and a radio source is denoted by d.
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