par'ticle beam"

1. Physics.a concentrated stream of particles, as electrons, neutrons, or protons, generated for studying particle interactions, nuclear structure, crystal structure, etc.
2. Mil.a high-energy stream of such particles for use as a weapon or for antimissile defense.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

particle acceleratorparticle board
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