Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: Translation of German X-strahl, X representing 'unknown'

X-ray

1 noun
     
NEW! See related topics: HOSPITAL
X-ray1 [countable]
1MH a beam of radiation (1) that can go through solid objects and is used for photographing the inside of the body
2MH a photograph of part of someone's body, taken using X-rays to see if anything is wrong:
The X-ray showed that her leg was not broken.
3MH a medical examination made using X-rays:
I had to go to hospital for an X-ray.
a chest X-ray
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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