SHADOWGRAPH

radiogram, radiograph, shadowgraph, skiagraph, skiagram

(noun) a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays)

Source: WordNet® 3.1

Etymology

Noun

shadowgraph (plural shadowgraphs)

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

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

Verb

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

(transitive) To outline in a shadow-picture on a screen.

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

Source: Wiktionary