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colliding-beam machine

[kuh-lahy-ding-beem]
noun Physics.
  1. a particle accelerator in which positively and negatively charged particles circulate in opposite directions and collide head-on.
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Also called col·lid·er [kuh-lahy-der] /kəˈlaɪ dər/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018