heliograph

[hee-lee-uh-graf, -grahf]
noun
1.
a device for signaling by means of a movable mirror that reflects beams of light, especially sunlight, to a distance.
2.
Astronomy, photoheliograph.
3.
Meteorology. an instrument for recording the duration and intensity of sunshine.
4.
Photography, Printing. an early type of photoengraving made on a metal plate coated with sensitized asphalt.
verb (used with object), verb (used without object)
5.
to communicate by heliograph.

Origin:
1815–25; helio- + -graph

heliographer [hee-lee-og-ruh-fer] , noun
heliographic [hee-lee-uh-graf-ik] , heliographical, adjective
heliographically, adverb
heliography, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
heliograph (ˈhiːlɪəʊˌɡrɑːf, -ˌɡræf)
 
n
1.  an instrument with mirrors and a shutter used for sending messages in Morse code by reflecting the sun's rays
2.  a device used to photograph the sun
 
heliographer
 
n
 
heliographic
 
adj
 
helio'graphical
 
adj
 
heli'ography
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
One unique military experiment, the heliograph, was a device using mirrors and reflected sunlight.
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