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Meaning of colliding-beam machine

col•lid'ing-beam' machine"

Pronunciation: (ku-lī'ding-bēm'), [key]
— Physics. Physics.
  1. a particle accelerator in which positively and negatively charged particles circulate in opposite directions and collide head-on. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.