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heliograph (n.)
1848, "instrument for taking photographs of the sun," from helio- "sun" + -graph "something written." Earlier, "a description of the sun" (1706, implied in heliographic). From 1877 as the name of a movable mirror used in signaling. Related: Heliographical.
Heliography (1845) was the word for the product of a type of engraving process by chemical reaction from exposure to sunlight. It also was an early term for what came to be called photography (1840).
updated on October 14, 2021
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Dictionary entries near heliograph
Helicon
helicopter
Heligoland
helio-
heliocentric
heliograph
heliolatry
heliophobia
heliotrope
heliotropism
heliport