collimator


col·li·ma·tor

noun \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

col·li·ma·tor

noun \ˈkäl-ə-ˌmāt-ər\   (Medical Dictionary)

Medical Definition of COLLIMATOR

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

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