Sid″er‐o‐stat (?), n. [L. sidus, sideris, a star + Gr. ��� standing, fixed, fr. ���� to place.] (Astron.) An apparatus consisting essentially of a mirror moved by clockwork so as to throw the rays of the sun or a star in a fixed direction; — a more general term for heliostat.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.