shadowgraph

A shadow-picture; a radiograph or X-ray photograph; a sciagram.

`There you have its exemplification, a shadowgraph of vapour, penetrated by a single concrete element - my Mind.

An optical technique of visualizing patterns of fluid flow by using differences in refractive index

To outline in a shadow-picture on a screen.

To take a picture by means of X-ray, radium, or similar source of actinic radiation.