Definition of "heliograph" in Anglais

noun

1. An apparatus for signalling by means of a moveable mirror which reflects flashes of sunlight.

2. A heliogram.

3. An instrument for measuring the intensity of sunlight.

4. A device for photographing the sun.

5. (obsolete) A photograph.

verb

1. (transitive) To send a message by heliograph.

2. (intransitive) To send a heliograph.

3. (transitive, dated) To photograph by sunlight.