shadowgraph

/SH AE1 D OW0 G R AE0 F/

noun

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

verb

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

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