Definitions of tracer:
  • noun:   ammunition whose flight can be observed by a trail of smoke
  • noun:   (radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes
  • noun:   an instrument used to make tracings
  • noun:   an investigator who is employed to find missing persons or missing goods

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See tracer used in context: 4 rhymes, several books and articles.

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