annihilation radiation

noun Physics.

electromagnetic radiation produced by the coalescence and mutual annihilation of a positron and an electron, each pair forming two photons having a minimum energy of 0.5 million electron volts each.

Nearby words

  1. annie oakley,
  2. annigoni,
  3. annihilable,
  4. annihilate,
  5. annihilation,
  6. annihilator,
  7. anniston,
  8. anniv.,
  9. anniversary,
  10. anniversary day

Origin of annihilation radiation

First recorded in 1960–65 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019