X

n. Electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target.

Syn. - X-radiation, roentgen ray. A radiogram made by exposing photographic film to X rays; used in medical diagnosis

Syn. - roentgenogram, X ray, X-ray picture, X-ray photograph. So called from the discoverer, W. C. Rontgen. - X ray, the Rontgen ray; - so called by its discoverer because of its enigmatical character, x being an algebraic symbol for an unknown quantity.

Old definition: Rontgen ray (Phys.), a kind of ray generated in a very highly exhausted vacuum tube by the electrical discharge. It ...