Indicator, Reagent, or Diagnostic Aid
tracer Audio
trac·er [ trey-ser ]
Definitions related to tracer:
  • A substance (such as a radioisotope) used in imaging procedures.
    NCI Dictionary of Cancer Terms
    U.S. National Cancer Institute, 2021
  • A substance that is identifiable by virtue of its radioactive signature, color, or other distinguishing physical property, such as a dye, radioactive isotope, or inert chemical, that is introduced into a biological or mechanical system and can be followed through the course of a process, providing information on the pattern of events in the process or on the redistribution of the parts, elements, or events involved.
    NCI Thesaurus
    U.S. National Cancer Institute, 2021
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