[ foh-tuh-hee-lee-uh-graf, -grahf ]
/ ˌfoʊ təˈhi li əˌgræf, -ˌgrɑf /
an instrument for photographing the sun, consisting of a camera and a specially adapted telescope.
Origin of photoheliograph
Also called heliograph.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019