autocollimator

autocollimator [aw-toh-kol-uh-mey-ter] WORD ORIGIN noun Optics. an instrument combining the functions of a telescope and collimator, for detecting and measuring very small deviations in a beam of light. Liberaldictionary.com

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Origin of autocollimator auto-3 + collimator Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019