TRACER

• (noun) ammunition whose flight can be observed by a trail of smoke

  synonyms : tracer bullet

• (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

WordNet® 3.0, © 2006 by Princeton University.

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