'Siderostat' definitions:

Definition of 'Siderostat'

From: GCIDE

Siderostat \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. [1913 Webster]