/ Dictionary / Index C colliding-beam machine: Meaning and Definition of Find definitions for: col•lid'ing-beam' machine" Pronunciation: (ku-lī'ding-bēm'), [key] — Physics. Physics. 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. collide collie Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language