SHADOWGRAPH
\ʃˈadə͡ʊɡɹˌaf], \ʃˈadəʊɡɹˌaf], \ʃ_ˈa_d_əʊ_ɡ_ɹ_ˌa_f]\
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a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays)
By Princeton University
Word of the day
Snake's-head
- Guinea-hen flower; -- so called in England because its spotted petals resemble the scales of a snake's head.