Definition of photoheliography in US English:

photoheliography

noun

Astronomy
  • Photography of the sun.

Origin

Mid 19th century; earliest use found in The Reader. From photo- + heliography, after photoheliograph, photoheliographic.

Pronunciation

photoheliography

/ˌfəʊtəʊhiːlɪˈɒɡrəfi/