Definition of heliostat in English:

heliostat

noun

  • An apparatus containing a movable or driven mirror, used to reflect sunlight in a fixed direction.

    See also coelostat
    • ‘Many of the offices are located on the perimeter for direct access, while offices on the interior enjoy indirect light from strategically located heliostats, mirrors, and reflective surfaces that bounce light throughout the atrium.’
    • ‘A heliostat (a rotating mirror used to track the Sun) may be used to reflect an image horizontally into a camera.’
    • ‘Illumination came from sunlight reflected by a heliostat placed outside of a window on the fourth floor.’
    • ‘One is the ‘power tower,’ in which thousands of heliostats, or movable mirrors, beam sunlight up to a central tower, powering steam turbines.’
    • ‘The Battery Park City Authority, which has paid more than $1 million for the heliostats, hopes the extra sunlight will encourage people to use the space.’

Pronunciation

heliostat

/ˈhēlēəˌstat//ˈhiliəˌstæt/