Pyelogram and X ray

Pyelogram noun - An X ray of the kidneys and ureters.

X ray and pyelogram are semantically related. In some cases you can use "X ray" instead a noun "Pyelogram".

X ray noun - Electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target.

Pyelogram and X ray are semantically related. Sometimes you can replace term "Pyelogram" with "X ray", this terms are similar.