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sidereal time
sidereal year
siderite
sidero-
sideroad
siderolite
siderophilin
siderosis
siderostat
sidesaddle
sideshow
sideslip
sidesplitting
sidestep
sidestream smoke
sidestroke
sideswipe
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siderostat
sid·er·o·stat [ síddərə stàt ] (plural sid·er·o·stats)


noun 
Definition:
 
clock-driven astronomical instrument: an astronomical instrument consisting of a plane mirror driven by a clock mechanism that keeps an astronomical object within the same field of view of a telescope
[Mid-19th century. < Latin sider- "star"]

sid·er·o·stat·ic [ sìddərə státtik ] adjective
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