Толковый словарь английского языка - x-ray
X-ray
x-ray
noun Date: 1896 any of the electromagnetic radiations that have an extremely short wavelength of less than 100 angstroms and have the properties of penetrating various thicknesses of all solids, of producing secondary radiations by impinging on material bodies, and of acting on photographic films and plates as light does, a photograph obtained by use of ~s, ~ adjective
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1.
n. & v. (also x-ray) --n. 1 (in pl.) electromagnetic radiation of short wavelength, able to pass through opaque bodies. 2 an image made by the effect of X-rays on a photographic plate, esp. showing the position of bones etc. by their greater absorption of the rays. --v.tr. photograph, examine, or treat with X-rays. Phrases and idioms X-ray astronomy the branch of astronomy concerned with the X-ray emissions of celestial bodies. X-ray crystallography the study of crystals and their structure by means of the diffraction of X-rays by the regularly spaced atoms of a crystalline material. X-ray tube a device for generating X-rays by accelerating electrons to high energies and causing them to strike a metal target from which the X-rays are emitted. Etymology: transl. of G x-Strahlen (pl.) f. Strahl ray, so called because when discovered in 1895 the nature of the rays was unknown ...Толковый словарь английского языка Oxford English Reference
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