contrast material is a noun meaning "a substance that is opaque to x-rays; when administered it allows a radiologist to examine the organ or tissue it fills". It carries one recorded sense.
a substance that is opaque to x-rays; when administered it allows a radiologist to examine the organ or tissue it fills
Definitions, synonyms and semantic relations for contrast material come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.