One entry found for tracer.

Main Entry: trac·er
Pronunciation: tr-sr
Function: noun
1 a : a person who traces missing persons or property b : an inquiry sent out in tracing a shipment lost in transit
2 a : ammunition containing a chemical composition to mark the flight of projectiles by a trail of smoke or fire b : a substance and especially a labeled element or atom used to trace the course of a chemical or biological process