Medical Definition of X-ray
1: any of the electromagnetic radiations of the same nature as visible radiation but of an extremely short wavelength less than 100 angstroms that is produced by bombarding a metallic target with fast electrons in vacuum or by transition of atoms to lower energy states and that has the properties of ionizing a gas upon passage through it, of penetrating various thicknesses of all solids, of producing secondary radiations by impinging on material bodies, of acting on photographic films and plates as light does, and of causing fluorescent screens to emit light—called also
2: a photograph obtained by use of X-rays <a chest X-ray>
Medical Definition of x–ray
: to examine, treat, or photograph with X-rays
Seen and Heard
What made you want to look up X-ray? Please tell us where you read or heard it (including the quote, if possible).