contrast+medium

One entry found for contrast medium.

Main Entry: contrast medium
Function: 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