Diagnosis using x-rays; or, more broadly, diagnostic imaging, including radiology, ultrasound, and magnetic resonance.
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ra·dio·di·ag·no·sis -.dī-ig-'nō-səs n, pl -no·ses -.sēz diagnosis by means of radiology compare RADIOTHERAPY
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ra·dio·di·ag·no·sis (ra″de-o-di″əg-noґsis) diagnosis by means of x-rays and radiographs.Medical dictionary. 2011.