1. shadowgraph - Noun
2. shadowgraph - Verb
a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays)
Source: WordNetIn the world of physics we watch a shadowgraph performance of the drama of familiar life. Arthur Eddington
Blunt body entry vehicles Various reentry shapes (NASA) using shadowgraphs to show high-velocity flow These four shadowgraph images represent early reentry-vehicle concepts. Source: Internet
The sound field is sufficiently intense for it to appear on a shadowgraph as shown in the figure on the right (from M.G. Davies) for a rectangular supersonic jet. Source: Internet