D defs.my
Entry 1 sense Webster, 1913

Photonephograph

/(fō`tō̇*nĕf"ō̇*grȧf)/ · Pho·to·neph·o·graph · IPA
01 n. A nephoscope registering by photography, commonly consisting of a pair of cameras used simultaneously.
  1. 1.
    A nephoscope registering by photography, commonly consisting of a pair of cameras used simultaneously.(Meteor.)