X-ray: 1. 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. 2. An image obtained by means of X-rays.
Library > Literature & Language > Dictionary also X-ray ( Ä•ks ' rÄ ' ) n. also x ray or X ray A relatively high-energy photon having a wavelength in the approximate ...
noun Also, x ray, X ray. 1. Physics . a. Often, x-rays. a form of electromagnetic radiation, similar to light but of shorter wavelength and capable of penetrating ...
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