He"li*o*stat(?), n. [Helio- + Gr. placed, standing, fr. to place, stand: cf. F. hliostate.] 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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Sun 30th August 2015