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particle beam

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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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
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
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