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collimator

The English word “collimator” has 3 meanings listed here.

noun

  1. An optical device that generates a parallel beam of light. Often used to compensate for laser beam divergence.
  2. A similar device that produces a parallel beam of particles such as neutrons.
  3. A small telescope attached to a larger one, used to point it in the correct general direction.

Etymology

From collimate + -or.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.