D defs.my
Entry 1 sense Webster, 1913

Oroheliograph

· Or·o·he·li·o·graph · IPA
01 n. A camera for obtaining a circular panoramic view of the horizon. The photographic plate is placed horizontally with a vertical lens above.…
  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 mirror of peculiar shape reflects light from the entire horizon to the lens, by means of which it is focused upon the plate.(Photog.)