shadowgraph

• shadow-graph, shadow graph

From shadow +‎ -graph.

shadowgraph (plural shadowgraphs)

1. A shadow-picture; a radiograph or X-ray photograph; a sciagram.
2. (physics) An optical technique of visualizing patterns of fluid flow by using differences in refractive index

• shadowgraphic
• shadowgraphist
• shadowgraphy

shadowgraph (third-person singular simple present shadowgraphs, present participle shadowgraphing, simple past and past participle shadowgraphed)

1. (transitive) To outline in a shadow-picture on a screen.
2. (photography) To take a picture by means of X-ray, radium, or similar source of actinic radiation.