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