tracer

Noun
  1. is a type of: detective, investigator, police detective, tec - a police officer who investigates crimes
  2. is a type of: instrument - a device that requires skill for proper use
  3. referred to in: radiology - the branch of medical science dealing with the medical use of X-rays or other penetrating radiation
    is a type of: radioisotope - a radioactive isotope of an element; produced either naturally or artificially
  4. is a type of: ammo, ammunition - projectiles to be fired from a gun
    same as: tracer bullet

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