Usually means: Instrument for safely observing the sun.
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We found 15 dictionaries that define the word helioscope:

General (13 matching dictionaries)
  1. helioscope: Collins English Dictionary
  2. helioscope: Wordnik
  3. helioscope: Wiktionary
  4. helioscope: Infoplease Dictionary
  5. Helioscope, helioscope: Dictionary.com
  6. Helioscope (studio), Helioscope: Wikipedia, the Free Encyclopedia
  7. Helioscope: Online Plain Text English Dictionary
  8. helioscope: Webster's Revised Unabridged, 1913 Edition
  9. Helioscope: AllWords.com Multi-Lingual Dictionary
  10. helioscope: Webster's 1828 Dictionary
  11. helioscope: FreeDictionary.org
  12. helioscope: The Phrontistery - A Dictionary of Obscure Words
  13. Helioscope: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. helioscope: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Definitions from Wiktionary (helioscope)

noun:  (astronomy) An apparatus for viewing the Sun without harming the eye, by means of an optical filter that attenuates most of sunlight while allowing only a small amount of the solar radiation.

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