Heliograph definition

hēlē-ə-grăf
Frequency:
A device for transmitting messages by reflecting sunlight.
noun
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A device capable of imaging the surface and outer regions of the sun.
noun
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To send (a message) by heliograph.
verb
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To send a heliograph.
verb
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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
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To signal or communicate by heliograph.
verb
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noun
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noun
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An instrument for measuring the intensity of sunlight.
noun
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noun
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To send a message by heliograph.
verb
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(intransitive) To send a heliograph.
verb
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Other Word Forms

Noun

Singular:
heliograph
Plural:
heliographs

Origin of heliograph

  • From helio- +‎ -graph.

    From Wiktionary