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2017 Word of the Year

annihilation radiation

noun, Physics.
1.
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.
Origin of annihilation radiation
1960-1965
First recorded in 1960-65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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