[ hee-lee-uh-stat ]
/ ˈhi li əˌstæt /


an instrument consisting of a mirror moved by clockwork, for reflecting the sun's rays in a fixed direction.

Origin of heliostat

From the New Latin word heliostata, dating back to 1740–50. See helio-, -stat

Related forms

he·li·o·stat·ic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for heliostat

British Dictionary definitions for heliostat


/ (ˈhiːlɪəʊˌstæt) /


an astronomical instrument used to reflect the light of the sun in a constant direction

Derived Forms

heliostatic, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012