X-rays are high-energy electromagnetic waves that can pass through soft tissue. They are used in medicine to make images of bones and teeth, and in security scanning. The term also refers to the resulting images captured by these rays.
Words can be like X-rays if you use them properly -- they'll go through anything. You read and you're pierced. Aldous Huxley
X-rays ... I am afraid of them. I stopped experimenting with them two years ago, when I came near to losing my eyesight and Dally, my assistant practically lost the use of both of his arms. Thomas Edison
When I told my doctor I couldn't afford an operation, he offered to touch-up my X-rays. Henny Youngman
In general, the objects in the universe that are very high-energy objects, or the processes that are high-energy processes, will radiate more in the short wavelength range towards the gamma rays or the x-rays. Claude Nicollier
For X-rays, the phenomenon of diffraction by crystals was a natural consequence of the idea that X-rays are waves analogous to light and differ from it only by having a smaller wavelength. Louis de Broglie
For in 1900 all electromagnetic radiation of longer wavelengths was already known at least to the extent that one could not seek in it the more striking characteristics of X-rays such as, for example, the strong penetrating power. Max von Laue