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autocollimator

American

[aw-toh-kol-uh-mey-ter] / ˌɔ toʊˈkɒl əˌmeɪ tər /

noun

Optics.

an instrument combining the functions of a telescope and collimator, for detecting and measuring very small deviations in a beam of light.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023