A meteorological optical phenomenon similar to a crepuscular ray, but appearing opposite the Sun in the sky.

plural of raying room

radiograph

The therapeutic use of controlled doses of X-rays

(analytical chemistry) A device for analyzing the chemical composition of substances using the characteristic spectral lines produced by their interaction with X-rays.

(analytical chemistry) A technique in which the patterns formed by the diffraction of X-rays on passing through a crystalline substance yield information on the lattice structure of the crystal, and the molecular structure of the substance.

(analytical chemistry) The use of an X-ray spectrometer for chemical analysis.

A device that produces X-rays by directing energetic electrons into a metal target.

(physics) The scattering of X-rays by the regular lattice of atoms or molecules in a crystal. / (physics) The diffraction pattern so obtained.

a vacuum tube in which electrons from a heated cathode are focused and deflected onto a phosphorescent screen; used in television sets etc