- (n.) A picture taken by heliography; a photograph.
- (n.) An apparatus for telegraphing by means of the sun's rays. See Heliotrope, 3.
- (n.) An instrument for taking photographs of the sun.
- (v.t.) To photograph by sunlight.
- (v.t.) To telegraph or signal, with a heliograph.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). heliograph. Retrieved September 23, 2026, from http://smartdefine.org/heliograph/definitions/2015701 |
| Chicago | Webster's. 2011. "heliograph" http://smartdefine.org/heliograph/definitions/2015701 (accessed September 23, 2026). |
| Harvard | Webster's 2011, heliograph, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/heliograph/definitions/2015701>. |
| MLA | Webster's. "heliograph" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/heliograph/definitions/2015701> |