| X contact X接点（万次及MF级灯闪光连动用） | X-ary diffraction topography X射线衍射拓捕学 | X-axis X轴[线] |
| X-band X带 | X-component X轴向分量 | X-coordinate X坐标，横坐标 |
| X-cut crystal X切割晶体 | X-flash X 闪光灯 | X-line X轴，X线 |
| X-parallax X视差 | X-radiation X辐射 | X-radioray X射线 |
| X-ray (Rontgen ray) X射线（伦琴射线） | X-ray crystal analysis X射线结晶分析 | X-ray crystallography X射线晶体学 |
| X-ray detectoscopy X射线探伤法 | X-ray diffraction X射线衍射 | X-ray diffraction camera X射线衍射照相机 |
| X-ray diffraction contrast X射线衍衬法 | X-ray diffractogram X射线衍射图 | X-ray diffractometer X射线衍射仪 |
| X-ray diffractometry X射线衍射测量术 | X-ray emission spectrum X射线发射谱 | X-ray examination X射线检查 |
| X-ray fluorescence X射线荧光 | X-ray hologram X射线全息图 | X-ray holography X射线全息术 |
| X-ray image dissection X射线析像 | X-ray image intensifier X线像加强器 | X-ray imaging telescope X射线望远镜 |
| X-ray inspection X射线检查 | X-ray interferometer X射线干涉仪 | X-ray interferometry X射线干涉测量术 |
| X-ray laser X射线激光器 | X-ray metallography X射线金相学 | X-ray microbeam technique X射线微束技术 |
| X-ray microscope X射线显微镜 | X-ray microscopy X射线显微术 | X-ray monochromator X射线单色器 |
| X-ray optics X射线光学 | X-ray photograph X射线照相 | X-ray photography X光照相术 |
| X-ray radiography X射线照相 | X-ray space detector X射线宇宙探测器 | X-ray spectrograph X射线摄谱仪 |
| X-ray spectrography X射线摄谱学 | X-ray spectrometer X射线分光计 | X-ray telespcope X射线望远镜 |
| X-ray transmission photograph X射线透射照相 | X-ray-induced fluorescence X射线感应发光，X射线感应荧光 | X-tal 晶体 |
| X-tilt X倾角 | X-tube X[形]管 | X-type X形，交叉形 |
| X-unit (X.U.) X单位（波长单位，=10-11厘米） | xanhopsia 黄视症 | xaser (X-ray laser) X射线激光器 |
| Xe-lamp 氙灯 | XeF laser 氟化氙激光器 | xenon (Xe) 氙 |
| Xenon /Xenon Flashlamps Light Sources 氙灯 | xenon excimer laser 氙受激准分子激光器 | xenon flash lamp 氙闪光灯 |
| xenon flashtube 氙-氦激光器 | xenon lamp 氙灯 | xenon laser 氙激光器 |
| Xenon Lasers 氙分子激光 | xenon long-arc lamp 长弧氙灯 | xenon pulsed light source 脉冲氙灯 |
| xenon search light 氙控照灯 | xenon short-arc lamp 短弧氙灯 | xenon tube 氙灯 |
| xenon-acr lamp 氙弧灯 | xenon-filled flashtube 充氙闪光管 | xenon-filled linear flash lamp 充氙线性闪光灯 |
| xenon-helium laser 氙-氪激光器 | xenon-mercury lamp 汞氙灯 | xerography 静电印刷术，干印术 |
| xeroradiography 干板X射线照相术 | xerox 静电印刷复制 | xi-jhyperon X超子 |
| xylene 二甲苯 | xyloid 木质的 | xylol 混合二甲苯 |
| xylonite 赛珞璐（热塑性硝化纤雄） |
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