tracer

nouns

an investigator who is employed to find missing persons or missing goods
tracer
is a type of (narrower)
a police officer who investigates crimes
detective, investigator, police detective, tec
an instrument used to make tracings
tracer
is derived from
trace
is derived from
trace
is a type of (narrower)
a device that requires skill for proper use
instrument
(radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes
tracer
domain category
the branch of medical science dealing with the medical use of X-rays or other penetrating radiation
radiology
is a type of (narrower)
a radioactive isotope of an element; produced either naturally or artificially
radioisotope
ammunition whose flight can be observed by a trail of smoke
tracer, tracer bullet