Definitions from Wiktionary (shadowgraph)

▸ noun:  A shadow-picture; a radiograph or X-ray photograph; a sciagram.
▸ noun:  (physics) An optical technique of visualizing patterns of fluid flow by using differences in refractive index
▸ verb:  (transitive) To outline in a shadow-picture on a screen.
▸ verb:  (photography) To take a picture by means of X-ray, radium, or similar source of actinic radiation.
▸ Also see shadowgraph



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