heliograph
/ˈhiː.li.əˌɡɹæf/ noun, verb
Forms heliographs heliographing heliographed
- noun An apparatus for signalling by means of a moveable mirror which reflects flashes of sunlight.
- noun A heliogram.
- noun An instrument for measuring the intensity of sunlight.
- noun A device for photographing the sun.
- noun (obsolete) A photograph.
- verb (transitive) To send a message by heliograph.
- verb (intransitive) To send a heliograph.
- verb (transitive, dated) To photograph by sunlight.
- verb (figurative) To message or indicate as though by heliograph.
Etymology
From helio- + -graph.
Webster’s 1913
- noun A picture taken by heliography; a photograph.
- noun An instrument for taking photographs of the sun.
Etymology [Helio- + -graph.]
Sources: Wiktionary · Webster’s 1913 — from the Wiktionary entry “heliograph”, CC BY-SA 4.0. Details