RADIOGRAPH (2)

Ra″di‐o‐graph (?), n. [[Radio- + -graph.]] 1. 1. An instrument for measuring and recording solar radiation.
2. 2. An image or picture produced upon a sensitive surface, as of a photographic plate, by some form of radiation other than light, as the Röntgen rays, radium rays, etc.; esp., a picture of opaque objects traversed by the rays; a skiagraph.