What's the meaning of x rays?

Answer 1

The "x" is not an abbreviation of another word. It's the "x" from algebra,

which refers to any unknown quantity. Wilhelm Roentgen did not know

what had passed through his hand and accidentally produced an image

of the bones in his hand on a nearby piece of film, and he referred to

whatever it was as "X strahlen" ... German for "X rays" where 'X' means

'unknown'. In Europe X-rays are known as Roentgen rays.

X-Radiation is a form of electromagnetic radiation having a wavelength of

0.01 to 10 nanometers.

Answer 2

Originally, the term meant something like "an unknown ray" of some kind. The "X" ray or unknown ray was investigated by a number of early scientists. Wilhelm Röntgen was one of them, and he referred to the radiation in this way (as an "X-ray"). And that name stuck, though in many different languages the X-ray is referred to as Röntgen waves.

Wikipedia has a great article on X-rays with more information than you want - including a history of the investigations that lead up to an accurate description as to their source. A link is provided, and you'll find it below.

Answer 3

The meaning of the term x-rays is an internal image that is taken with an electromagnetic wave of high energy and very short wavelength. X-rays are commonly taken of the human body to detect injuries.