: one that traces, tracks down, or searches out: as
a : a person who traces missing persons or property and especially goods lost in transit
b : an inquiry sent out in tracing a shipment lost in transit
: one who traces designs, patterns, or markings
: a device (as a stylus) used in tracing
a : ammunition containing a chemical composition to mark the flight of projectiles by a trail of smoke or light
b : a substance used to trace the course of a chemical or biological process; especially : label 3d Examples of TRACER The enemy fired
tracers at the aircraft carrier. They injected her with a radioactive
tracer and tracked it via X-rays.
First Known Use of TRACER
trac·er noun \ ˈtrā-sər\ (Medical Dictionary)
: a substance used to trace the course of a process; specifically : a labeled element or atom that can be traced throughout chemical or biological processes by its radioactivity or its unusual isotopic mass Seen & Heard
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tracer? Please tell us where you read or heard it (including the quote, if possible).