X
X-ray – an electromagnetic wave of very short wavelength, able to pass through many materials opaque to light.
Xenon – an inert gaseous chemical element, present in trace amounts in the air and used in some kinds of electric light.
X-ray – an electromagnetic wave of very short wavelength, able to pass through many materials opaque to light.
Xenon – an inert gaseous chemical element, present in trace amounts in the air and used in some kinds of electric light.