WordNet
contrast material
n. a substance that is opaque to x-rays; when administered it allows a radiologist to examine the organ or tissue it fills [syn: contrast medium]
Usage examples of "contrast material".
The technician returned and announced that the contrast material had been given.
She took delight in using words like pilocytic astrocytoma (her tumor), prothrombin (a plasma protein used in the clotting of blood), and contrast material (dye used in the CAT scan she'd had just that morning).