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tracer
has definitions from the fields of military,arms,chemistry,physics,medicine,pharmacology,radiology,law
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[ noun ] (radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes
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[ noun ] an instrument used to make tracings
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[ noun ] (law) an investigator who is employed to find missing persons or missing goods
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[ noun ] (military,arms) ammunition whose flight can be observed by a trail of smoke
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