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tracer (trāsīәr)   a means or agent by which certain substances or structures can be identified or followed, as a radioactive tracer.
  a mechanical device by which the outline of an object or the direction and extent of movement of a part may be graphically recorded; see also tracing.
  a dissecting instrument for isolating vessels and nerves.
 

radioactive tracer  a radioactive isotope replacing a stable chemical element in a compound (said to be radiolabeled) and so able to be followed or tracked through one or more reactions or systems by means of a radiation detector; used especially for such a compound that is introduced into the body for study of the compound's metabolism, distribution, and passage through the body.





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