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autocollimator

[ aw-toh-kol-uh-mey-ter ]
/ ˌɔ toʊˈkɒl əˌmeɪ tər /
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noun Optics.
an instrument combining the functions of a telescope and collimator, for detecting and measuring very small deviations in a beam of light.
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Origin of autocollimator

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
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