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Glossary - X

X-ray - High-energy radiation with waves shorter than those of visible light. X-rays possess the properties of penetrating most substances (to varying extents), of acting on a photographic film or plate (permitting radiography), and of causing a fluorescent screen to give off light (permitting fluoroscopy). In low doses X-rays are used for making images that help to diagnose disease, and in high doses to treat cancer. Formerly called a Roentgen ray.

Xeroderma: Abnormally dry skin.

Xeroradiograph: A picture of the body recorded on paper rather than on film. Also called a xerogram.

Xerosis: Abnormal dryness of the skin (xeroderma).

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