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 氙分子雷射
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，乾印术
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）