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autocollimator

[aw-toh-kol-uh-mey-ter] /ˌɔ toʊˈkɒl əˌmeɪ tər/
noun, Optics.
1.
an instrument combining the functions of a telescope and collimator, for detecting and measuring very small deviations in a beam of light.
Origin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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