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Webster's 1913 Dictionary

SIDEROSTAT

Sid "er *o *stat, n. Etym: [L. sidus, sideris, a star + Gr. (Astron.)

Defn: 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.

New American Oxford Dictionary

siderostat

sid er o stat |ˈsidərəˌstat ˈsɪdərəstæt | ▶noun Astronomy an instrument used for keeping the image of a celestial object in a fixed position.

Oxford Dictionary

siderostat

siderostat |ˈsɪd (ə )rə (ʊ )stat, ˈsʌɪ -| ▶noun Astronomy an instrument used for keeping the image of a celestial object in a fixed position.