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.
Nearby words
heliocentric parallax, heliochrome, heliodor, heliogabalus, heliogram, heliograph, heliogravure, heliolatry, heliolithic, heliometer, heliopause
Related forms
he·li·og·ra·pher [hee-lee-og-ruh-fer] /ˌhi liˈɒg rə fər/, nounhe·li·o·graph·ic [hee-lee-uh-graf-ik] /ˌhi li əˈgræf ɪk/, he·li·o·graph·i·cal, adjectivehe·li·o·graph·i·cal·ly, adverbhe·li·og·ra·phy, nounDictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for heliograph
British Dictionary definitions for heliograph
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
heliographer (ˌhiːlɪˈɒɡrəfə), nounheliographic (ˌhiːlɪəʊˈɡræfɪk) or heliographical, adjectiveheliography, nounCollins English Dictionary - Complete & Unabridged 2012 Digital Edition
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