collimator

/ˈkɑləˌmeɪdər/
IPA guide

Other forms: collimators

Definitions of collimator
  1. noun
    optical device consisting of a tube containing a convex achromatic lens at one end and a slit at the other with the slit at the focus of the lens; light rays leave the slit as a parallel beam
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    type of:
    optical device
    a device for producing or controlling light
  2. noun
    a small telescope attached to a large telescope to use in setting the line of the larger one
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    type of:
    scope, telescope
    a magnifier of images of distant objects
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