an electromagnetic radiation of extremely short wavelength that has the properties of penetrating various solids and of acting like light to expose photographic films and plates
an electromagnetic radiation of extremely short wavelength that has the properties of ionizing a gas when passing through it, of penetrating various thicknesses of all solids, and of acting like light to expose photographic films and plates
informal (used before a noun) involving the use of X-rays or having the ability to penetrate or see through solid substances
X-ray vision
an examination or photograph made by means of X-rays
translation of German X-Strahlen X-rays, from X + Strahl ray. X was used because when the rays were discovered their nature was not known