The Collaborative International Dictionary
Photonephograph
Photonephograph \Pho`to*neph"o*graph\ (f[=o]`t[-o]*n[e^]f"[-o]*gr[.a]f), n. [Photo- + Gr. ne`fos a cloud + -graph.] (Meteor.) A nephoscope registering by photography, commonly consisting of a pair of cameras used simultaneously.