gamma ray

noun Physics.
1.
a photon of penetrating electromagnetic radiation (gamma radiation) emitted from an atomic nucleus.
2.
a photon emitted by an electron as a result of internal conversion.
3.
electromagnetic radiation with wavelengths shorter than approximately one tenth of a nanometer.

Origin:
1900–05

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Collins
World English Dictionary
gamma rays
 
pl n
streams of gamma radiation

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

gamma ray n.
Electromagnetic radiation emitted from the nucleus of an atom by radioactive decay and having energies in a range from ten thousand (104) to ten million (107) electron volts.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
gamma ray  
A stream of high-energy electromagnetic radiation given off by an atomic nucleus undergoing radioactive decay. Because the wavelengths of gamma rays are shorter than those of x-rays, gamma rays have greater energy and penetrating power than x-rays. Gamma rays are emitted by pulsars, quasars, and radio galaxies but cannot penetrate the Earth's atmosphere. See more at radioactive decay.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Gamma rays are electromagnetic radiation at the highest-energy, or
  shortest-wavelength, end of the electromagnetic spectrum.
The atomic bomb released two types of radiation, easily-detectable gamma rays
  and fast neutrons, which are harder to measure.
And he has yet another new technique at his disposal, capable of focusing trace
  amounts of gamma rays.
They are marked by a fleeting, powerful pulse of gamma rays.
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