Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of collimator is as below...

Collimator :: Collimator (n.) A tube having a convex lens at one end and at the other a small opening or slit which is at the principal focus of the lens, used for producing a beam of parallel rays; also, a lens so used..

Collimator :: Collimator (n.) A telescope arranged and used to determine errors of collimation, both vertical and horizontal..

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