shadowgraph

Plural: shadowgraphs

Noun

• a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays)
• A shadow-picture; a radiograph or X-ray photograph; a sciagram.
• An optical technique of visualizing patterns of fluid flow by using differences in refractive index

Verb

• 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.

Synonyms

radiogram, radiograph, skiagram, skiagraph