The technique or practice of examining transparent or translucent objects using a diaphanoscope, or observation and study of objects by transmitted light.
From Greek 'diaphanês' (transparent) + 'skopein' (to observe) plus the suffix '-y' (the practice of). This term entered medical and scientific vocabulary in the 19th century.
Before modern CT scans and X-rays, diaphanoscopy was how doctors tried to see inside the body—they'd shine lights through patients' skin and tissues, looking for shadows that might indicate problems, essentially inventing the principle behind modern medical imaging.
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