Heliograph

·add. ·vt To photograph by sunlight.

II. Heliograph ·noun A picture taken by heliography; a photograph.

III. Heliograph ·noun An instrument for taking photographs of the sun.

IV. Heliograph ·add. ·vt To telegraph, or signal, with a heliograph.

V. Heliograph ·noun An apparatus for telegraphing by means of the sun's rays. ·see Heliotrope, 3.