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Definition of Contrast material
1. Noun. A substance that is opaque to x-rays; when administered it allows a radiologist to examine the organ or tissue it fills.
Medical Definition of Contrast material
1. A substance that is introduced into or around a structure and, because of the difference in absorption of X-rays by the contrast medium and the surrounding tissues, allows radiographic visualisation of the structure. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)