noun he·lio·stat \ˈhē-lē-ə-ˌstat\

Definition of heliostat

  1. :  an instrument consisting of a mirror mounted on an axis moved by clockwork by which a sunbeam is steadily reflected in one direction

Origin and Etymology of heliostat

New Latin heliostata, from 1heli- + Greek -statēs -stat

First Known Use: 1747

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