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Meaning of autocollimator

au•to•col•li•ma•tor

Pronunciation: (ô"tō-kol'u-mā"tur), [key]
— n. Optics.
  1. an instrument combining the functions of a telescope and collimator, for detecting and measuring very small deviations in a beam of light.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.