1
- an electromagnetic wave of high energy and very short wavelength (between ultraviolet light and gamma rays), which is able to pass through many materials opaque to lightX射线, X光。
1.1
- as modifier informal denoting an apparent or supposed faculty for seeing beyond an outward form〈非正式〉像X光一样（能看透外表）：
you didn't need X-ray eyes to know what was going on.
你不需要有X光似的眼睛也能知道正在发生什么事。
2
- a photographic or digital image of the internal composition of something, especially a part of the body, produced by X-rays being passed through it and being absorbed to different degrees by different materialsX光照片。
2.1
- an act of photographing someone or something in this wayX光检查：
he will have an X-ray today
他今天要作X光检查
mass noun would you send her for X-ray?你可以送她去作X光检查吗？
3
- a code word representing the letter X, used in radio communication（无线电通讯中使用的）字母X的代码词。
with obj.
- photograph or examine with X-rays用X光拍片（或检查）：
luggage bound for the hold is X-rayed.
准备送到货舱的行李要经X光检查。
词源
translation of German X-Strahlen (plural)， from X- （because， when discovered in 1895， the nature of the rays was unknown） + Strahl 'ray'.