noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The scientific study of the sun. uncountable
2. 2
   The art of making a heliograph. uncountable
3. 3
   The system of signalling by heliograph. uncountable
4. 4
   Photography. obsolete, uncountable

Synonyms

All synonyms

opticsphotometry

Etymology

From helio- + -graphy.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.