Heliograph definition
A device for transmitting messages by reflecting sunlight.
noun
A device capable of imaging the surface and outer regions of the sun.
noun
To send (a message) by heliograph.
verb
To send a heliograph.
verb
A permanent image formed on a glass plate by an early photographic process.
noun
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A signaling device that uses a mirror to flash the sun's rays to a distant observer.
noun
To signal or communicate by heliograph.
verb
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(intransitive) To send a heliograph.
verb
Origin of heliograph
- From helio- + -graph.
From Wiktionary