au·to·collimator
| \ " + \
plural -s
Definition of autocollimator
: a telescope with eyepiece adapted to the method of autocollimation either to collimate the instrument itself or to ensure that its axis is perpendicular to a reflecting surface
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“Autocollimator.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/autocollimator. Accessed 30 Sep. 2022.
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Time Traveler for autocollimator
The first known use of autocollimator was in 1903
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