helio static

heliostat

[hee-lee-uh-stat]
noun
an instrument consisting of a mirror moved by clockwork, for reflecting the sun's rays in a fixed direction.

Origin:
1740–50; < Neo-Latin heliostata. See helio-, -stat

heliostatic, adjective
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World English Dictionary
heliostat (ˈhiːlɪəʊˌstæt)
 
n
an astronomical instrument used to reflect the light of the sun in a constant direction
 
helio'static
 
adj

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