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| X-axis | The horizontal line of a graph. |
| X-ray | Penetrating, ionising electromagnetic radiation having a wavelength much shorter than that of visible light. |
| X-ray imaging system | An X-ray system designed for radiography, tomography, or fluoroscopy. |
| X-ray quality | The penetrability of an X-ray beam. |
| X-ray quantity | The output intensity of an X-ray imaging system, measured in roentgens (R). |
| X-Ray spectrum | The relative distribution of different energies in a photon beam. See spectrum. |
| X-ray tube rating charts | Charts that guide the technologist in the use of X-ray tubes. |
| Xiphoid | Greek xiphos = a sword, and eidos = shape or form; hence, sword-shaped |