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Table of Contents -- siderostat
POS
HYPHEN
CIDE DICTIONARY
OXFORD DICTIONARY
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siderostat

POS
 : 
Noun
HYPHEN
 : 
sid=er=o=stat
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CIDE DICTIONARY
siderostat, n. [L. sidus, sideris, a star + Gr. standing, fixed, fr. to place.].
     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]
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OXFORD DICTIONARY
siderostat, n. an instrument used for keeping the image of a celestial body in a fixed position.

Etymology
L sidus sideris star, after heliostat
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