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heliograph

[hee-lee-uh-graf, -grahf] /ˈhi li əˌgræf, -ˌgrɑf/
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
1815-1825
1815-25; helio- + -graph
Related forms
heliographer
[hee-lee-og-ruh-fer] /ˌhi liˈɒg rə fər/ (Show IPA),
noun
heliographic
[hee-lee-uh-graf-ik] /ˌhi li əˈgræf ɪk/ (Show IPA),
heliographical, adjective
heliographically, adverb
heliography, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for helio-graphing

heliograph

/ˈhiːlɪəʊˌɡrɑːf; -ˌɡræf/
noun
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
Derived Forms
heliographer (ˌhiːlɪˈɒɡrəfə) noun
heliographic (ˌhiːlɪəʊˈɡræfɪk), heliographical, adjective
heliography, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word of The Day

Difficulty index for heliograph

Few English speakers likely know this word

Word Value for helio

8
8
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