Etymology
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X-ray (n.)

1896, X-rays, translation of German X-strahlen, from X, algebraic symbol for an unknown quantity, + Strahl (plural Strahlen) "beam, ray." Coined 1895 by German scientist Wilhelm Conrad Röntgen (1845-1923), who discovered them, to suggest that the exact nature of the rays was unknown. As a verb by 1899. Meaning "image made using X-rays" is from 1934, earlier in this sense was X-radiograph (1899).

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Definitions of X-ray
1
x-ray (v.)
examine by taking x-rays;
x-ray (v.)
take an x-ray of something or somebody;
The doctor x-rayed my chest
2
X-ray (n.)
electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target;
Synonyms: X ray / X-radiation / roentgen ray
X-ray (n.)
a radiogram made by exposing photographic film to X rays; used in medical diagnosis;
Synonyms: roentgenogram / X ray / X-ray picture / X-ray photograph
From wordnet.princeton.edu