often, x-rays. a form of electromagnetic radiation, similar to light but of shorter wavelength and capable of penetrating solids and of ionizing gases.
such radiation having wavelengths in the range of approximately 0.1–10 nm.

a radiograph made by x-rays.
(initial capital letter) a word in communications to represent the letter x.
to examine, photograph, or treat with x-rays.
of or relating to x-rays.

electromagnetic radiation emitted when matter is bombarded with fast electrons. x-rays have wavelengths shorter than that of ultraviolet radiation, that is less than about 1 × 10–8 metres. they extend to indefinitely short wavelengths, but below about 1 × 10–11 metres they are often called gamma radiation
(as modifier): x-ray astronomy

a picture produced by exposing photographic film to x-rays: used in medicine as a diagnostic aid as parts of the body, such as bones, absorb x-rays and so appear as opaque areas on the picture
(usually capital) (communications) a code word for the letter x
verb (transitive)
to photograph (part of the body, etc) using x-rays
to treat or examine by means of x-rays

v. x-rayed or x-rayed, x-ray·ing or x-ray·ing, x-rays or x-rays

x-ray also x-ray

note: because x-rays can travel through solid material and affect photographic plates, they are widely used in diagnosing medical problems.

note: objects in the sky also send out x-rays in processes that use very high energy.

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