- 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.
- to communicate by heliograph.
Origin of heliograph
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for heliographic
On the 17th, heliographic communication was opened with General Ellis.Through Three Campaigns
G. A. Henty
Scanning the horizon line, he hurried impatiently toward the heliographic ridge.Vanishing Roads and Other Essays
Richard Le Gallienne
Mr. Maunder is charged with the heliographic photography and reductions, and with the preparation of the Library Catalogue.The Royal Observatory Greenwich
E. Walter (Edwared Walter) Maunder
The day following I received a heliographic message from these burghers, who were now on the other side of the line.Three Years' War
Christiaan Rudolf de Wet
In one division a regular pioneer squadron has been formed for telegraphic and heliographic duty.Afghanistan and the Anglo-Russian Dispute
Theo. F. Rodenbough
- 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
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
Word Origin and History for heliographic
Online Etymology Dictionary, © 2010 Douglas Harper