Usually means: Mirror that tracks the sun.
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We found 22 dictionaries that define the word heliostat:

General (16 matching dictionaries)
  1. heliostat: Merriam-Webster
  2. heliostat: Oxford Learner's Dictionaries
  3. heliostat: American Heritage Dictionary of the English Language
  4. heliostat: Collins English Dictionary
  5. heliostat: Wordnik
  6. heliostat: Wiktionary
  7. heliostat: Webster's New World College Dictionary, 4th Ed.
  8. heliostat: Infoplease Dictionary
  9. Heliostat, heliostat: Dictionary.com
  10. Heliostat: Wikipedia, the Free Encyclopedia
  11. Heliostat: Online Plain Text English Dictionary
  12. heliostat: Webster's Revised Unabridged, 1913 Edition
  13. Heliostat: AllWords.com Multi-Lingual Dictionary
  14. Heliostat: Dictionary of Phrase and Fable (1898)
  15. heliostat: FreeDictionary.org
  16. heliostat: TheFreeDictionary.com

Business (1 matching dictionary)
  1. Heliostat: Energy Dictionary

Computing (1 matching dictionary)
  1. heliostat: Encyclopedia

Science (1 matching dictionary)
  1. Heliostat: Solar Radiation Resource Terms

Tech (3 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. Glossary of Meteorology (No longer online)
  3. Glossary of Energy Terms (No longer online)

Definitions from Wiktionary (heliostat)

noun:  A device that includes a plane mirror which turns so as to keep reflecting sunlight toward a predetermined target, compensating for the sun's apparent motions in the sky. The target may be a physical object, distant from the heliostat, or a direction in space, and is almost always stationary relative to the heliostat, so the light is reflected in a fixed direction.

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