contrast medium
noun
: a substance (as a solution of iodine or suspension of barium sulfate) comparatively opaque to X-rays that is introduced into the body (as by injection or swallowing) to contrast an internal part (as the gastrointestinal tract, kidneys, or blood vessels) with its surrounding tissue in radiographic visualization
called also contrast agent, contrast material
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“Contrast medium.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/contrast%20medium. Accessed 29 Nov. 2024.
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