Bible Dictionaries
Siderostat
Webster's Dictionary
(n.) 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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Bibliography Information
Webster, Noah. Entry for 'Siderostat'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/s/siderostat.html. 1828.