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Entry 1 sense Webster, 1913

coelostat

· coe·lo·stat · IPA
01 n. an optical instrument used to follow the path of a celestial body and reflect its light into a telescope; it has a movable and a fixed mirror.
  1. 1.
    an optical instrument used to follow the path of a celestial body and reflect its light into a telescope; it has a movable and a fixed mirror.