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1. (n.) heliostat
an instrument consisting of a mirror moved by clockwork, for reflecting the sun's rays in a fixed direction.
Etymology: (1740–50; < NL heliostata. See helio -, -stat)
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| Definition of 'heliostat' |
Webster Dictionary |
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1. (noun) heliostat
an instrument consisting of a mirror moved by clockwork, by which a sunbeam is made apparently stationary, by being steadily directed to one spot during the whole of its diurnal period; also, a geodetic heliotrope
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Definitions of heliostat 
