gamma ray: Meaning and Definition of

gam'ma ray"

Pronunciation: [key]
— Physics. Physics.
  1. a photon of penetrating electromagnetic radiationemitted 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.