-oroheliograph-

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. ]