Oroheliograph \Or`o*he"li*o*graph\, n. [Gr. 'o`ros mountain +
helio- + -graph.] (Photog.)
A camera for obtaining a circular panoramic view of the
horizon. The photographic plate is placed horizontally with a
vertical lens above. A mirror of peculiar shape reflects
light from the entire horizon to the lens, by means of which
it is focused upon the plate.
[Webster 1913 Suppl.]