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collision
collision course
collision damage waiver
collision zone
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collocation
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collodion cotton
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collider

col·lid·er [ kə ldər ] (plural col·lid·ers) or col·lid·ing-beam ma·chine (plural col·lid·ing-beam ma·chines)


noun 
Definition:
 
particle accelerator: a particle accelerator in which two oppositely moving particle beams are made to collide. This allows the particles to use more of their energy to create new particles than when they collide with a fixed target.

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