collimator

noun
col·li·ma·tor | \ˈkä-lə-ˌmā-tər \

Definition of collimator 

1 : a device for producing a beam of parallel rays (as of light) or for forming an infinitely distant virtual image that can be viewed without parallax

2 : a device for obtaining a beam (as of particles) of limited cross section

First Known Use of collimator

1865, in the meaning defined at sense 1

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The first known use of collimator was in 1865

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collimator

noun
col·li·ma·tor | \ˈkäl-ə-ˌmāt-ər \

Medical Definition of collimator 

: a device for obtaining a beam of radiation (as X-rays) of limited cross section

More from Merriam-Webster on collimator

Britannica.com: Encyclopedia article about collimator

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