heliograph: Meaning and Definition of

he•li•o•graph

1. a device for signaling by means of a movable mirror that reflects beams of light, esp. sunlight, to a distance.
2. photoheliograph.
3. an instrument for recording the duration and intensity of sunshine.
4. an early type of photoengraving made on a metal plate coated with sensitized asphalt.

1. to communicate by heliograph.