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| con·trast me·di·um (plural con·trast me·di·a or con·trast me·di·ums) |
noun |
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| Definition: |
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substance that sharpens X-ray image: a substance opaque to X-rays that is used to fill a body cavity, making the outline of the body part easier to see on an X-ray photograph. Barium is frequently used as a contrast medium.
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