noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A camera for obtaining a circular panoramic view of the horizon. The photographic plate is placed horizontally with a vertical lens above. A specially-shaped mirror reflects light from the entire horizon to the lens, by means of which it is focused upon the plate.

Etymology

From oro- + heliograph, from Ancient Greek word for "mountain".

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