Heliograph Definition

hēlē-ə-grăf
heliographs
noun
A permanent image formed on a glass plate by an early photographic process.
Webster's New World
A device for transmitting messages by reflecting sunlight.
American Heritage
A signaling device that uses a mirror to flash the sun's rays to a distant observer.
Webster's New World
Wiktionary
verb
To signal or communicate by heliograph.
Webster's New World
To send a heliograph.
American Heritage

Other Word Forms of Heliograph

Noun

Singular:
heliograph
Plural:
heliographs

Origin of Heliograph

  • From helio- +‎ -graph.

    From Wiktionary

Heliograph Is Also Mentioned In

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heliograph