(n.) A telescope or instrument for viewing the sun without injury to the eyes, as through colored glasses or with mirrors which reflect but a small portion of light.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). helioscope. Retrieved September 20, 2026, from http://smartdefine.org/helioscope/definitions/2015713 |
| Chicago | Webster's. 2011. "helioscope" http://smartdefine.org/helioscope/definitions/2015713 (accessed September 20, 2026). |
| Harvard | Webster's 2011, helioscope, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/helioscope/definitions/2015713>. |
| MLA | Webster's. "helioscope" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/helioscope/definitions/2015713> |