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heliostat

[hee-lee-uh-stat]
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noun
  1. 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 formshe·li·o·stat·ic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for heliostat

heliostat

noun
  1. an astronomical instrument used to reflect the light of the sun in a constant direction
Derived Formsheliostatic, 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