contrast media

contrast medium

noun Medicine/Medical.
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.

Origin:
1950–55

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World English Dictionary
contrast medium
 
n
med a radiopaque substance, such as barium sulphate, used to increase the contrast of an image in radiography

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

contrast medium n.
A substance, such as barium or air, used in radiography to increase the contrast of an image. A positive contrast medium absorbs x-rays more strongly than the tissue or structure being examined; a negative contrast medium, less strongly.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
contrast medium   (kŏn'trāst')  Pronunciation Key 
A substance, such as barium or air, used in radiologic studies to increase the contrast of an image. In x-ray imaging, a positive contrast medium absorbs x-rays more strongly than the tissue or structure being examined; a negative contrast medium, less strongly.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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