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Origin and history of helio-

helio-

word-forming element meaning "sun," from Greek hēlios "sun" (from PIE root *sawel- "the sun").

Entries linking to helio-

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).

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