heliography

noun

he·​li·​og·​ra·​phy

ˌhēlēˈägrəfē

plural -es

1

[French héliographie, from hélio- heli- entry 1 + -graphie -graphy] : an early photographic process producing a photoengraving on a metal plate coated with an asphalt preparation

broadly : photography

2

[heli- entry 1 + -graphy] : the system, art, or practice of signaling with a heliograph

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