contrast medium

noun

Medical Definition of contrast medium

: 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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Cite this Entry

“Contrast medium.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/contrast%20medium. Accessed 22 Jan. 2021.

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