[foh-tuh-hee-lee-uh-graf, -grahf]
noun Astronomy.
an instrument for photographing the sun, consisting of a camera and a specially adapted telescope.
Also called heliograph.

1860–65; photo- + heliograph

photoheliographic [foh-tuh-hee-lee-uh-graf-ik] , adjective
photoheliography [foh-tuh-hee-lee-og-ruh-fee] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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