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particle beam

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noun
  1. Physics. a concentrated stream of particles, as electrons, neutrons, or protons, generated for studying particle interactions, nuclear structure, crystal structure, etc.
  2. Military. a high-energy stream of such particles for use as a weapon or for antimissile defense.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for particle beam

particle beam

noun
  1. a stream of energized particles produced by a particle accelerator
  2. such a stream emitted by a particle beam weapon
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012