1. tracer, detective, investigator, tec, police detective

usage: an investigator who is employed to find missing persons or missing goods

2. tracer, instrument

usage: an instrument used to make tracings

3. tracer, radioisotope

usage: (radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes

4. tracer, tracer bullet, ammunition, ammo

usage: ammunition whose flight can be observed by a trail of smoke

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See also: tracer (Dictionary)