Meaning of contrast medium

con'trast me"dium

Pronunciation: [key]
— Med. Med.
  1. a radiopaque substance injected into a part of the body, as the stomach or duodenum, to provide a contrasting background for the tissues in an x-ray or fluoroscopic examination.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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