Shadowgraph meaning

shăd'ō-grăf'
An image produced by casting a shadow on a screen.
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An image or silhouette produced by throwing a shadow upon a lighted surface.
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A shadow-picture; a radiograph or X-ray photograph; a sciagram.
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(physics) An optical technique of visualizing patterns of fluid flow by using differences in refractive index.
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To outline in a shadow-picture on a screen.
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(photography) To take a picture by means of X-ray, radium, or similar source of actinic radiation.
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Origin of shadowgraph