heliograph

[ hee-lee-uh-graf, -grahf ]
/ ˈhi li əˌgræf, -ˌgrɑf /

noun

a device for signaling by means of a movable mirror that reflects beams of light, especially sunlight, to a distance.
Astronomy. photoheliograph.
Meteorology. an instrument for recording the duration and intensity of sunshine.
Photography, Printing. an early type of photoengraving made on a metal plate coated with sensitized asphalt.

verb (used with or without object)

to communicate by heliograph.

Origin of heliograph

First recorded in 1815–25; helio- + -graph

OTHER WORDS FROM heliograph

he·li·og·ra·pher [hee-lee-og-ruh-fer] /ˌhi liˈɒg rə fər/, noun he·li·o·graph·ic [hee-lee-uh-graf-ik] /ˌhi li əˈgræf ɪk/, he·li·o·graph·i·cal, adjective he·li·o·graph·i·cal·ly, adverb he·li·og·ra·phy, noun

Example sentences from the Web for heliographic

British Dictionary definitions for heliographic

heliograph
/ (ˈhiːlɪəʊˌɡrɑːf, -ˌɡræf) /

noun

an instrument with mirrors and a shutter used for sending messages in Morse code by reflecting the sun's rays
a device used to photograph the sun

Derived forms of heliograph

heliographer (ˌhiːlɪˈɒɡrəfə), noun heliographic (ˌhiːlɪəʊˈɡræfɪk) or heliographical, adjective heliography, noun