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- Rhymes: -eɪtə(ɹ)
collimator (plural collimators)
- (physics) An optical device that generates a parallel beam of light. Often used to compensate for laser beam divergence.
- (physics) A similar device that produces a parallel beam of particles such as neutrons.
- (astronomy) A small telescope attached to a larger one, used to point it in the correct general direction.