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
A heliogram.
Wiktionary
verb
To signal or communicate by heliograph.
Webster's New World
To send a heliograph.
American Heritage
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Origin of Heliograph
From helio- + -graph.
From Wiktionary
Heliograph Is Also Mentioned In
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