tracer

/ˈtreɪsər/

/ˈtreɪsə/

Other forms: tracers

Definitions of tracer

1. noun

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

   detective, investigator, police detective, tec

   a police officer who investigates crimes
2. noun

   an instrument used to make tracings
   type of:

   instrument

   a device that requires skill for proper use
3. noun

   ammunition whose flight can be observed by a trail of smoke
   synonyms: tracer bullet

   type of:

   ammo, ammunition

   projectiles to be fired from a gun
4. noun

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

   radioisotope

   a radioactive isotope of an element; produced either naturally or artificially