—n.
1 a a signalling apparatus reflecting sunlight in flashes from a movable mirror. b a message sent by means of this; a heliogram.
2 an apparatus for photographing the sun.
3 an engraving obtained chemically by exposure to light.
—v.tr. send (a message) by heliograph.
Derivatives:
heliography n.
Useful english dictionary. 2012.