shadowgraph

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Noun

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

Verb

shadowgraph (shadowgraphs, present participle shadowgraphing; 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.

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