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Noun x-ray has 2 senses
X ray, X-radiation, roentgen ray - electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target--1 is a kind of electromagnetic radiation, electromagnetic wave, nonparticulate radiation; ionizing radiation
 
roentgenogram, X ray, X-ray picture, X-ray photograph - a radiogram made by exposing photographic film to X rays; used in medical diagnosis--2 is a kind of radiogram, radiograph, shadowgraph, skiagraph, skiagram
 --2 has particulars:
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