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heliograph

noun

he·​lio·​graph ˈhē-lē-ō-ˌgraf How to pronounce heliograph (audio)
: an apparatus for telegraphing by means of the sun's rays flashed from a mirror
heliograph transitive verb

Word History

Etymology

International Scientific Vocabulary

First Known Use

1877, in the meaning defined above

Time Traveler
The first known use of heliograph was in 1877

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