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BNC: 22266 COCA: 18424

tracer

noun

trac·​er ˈtrā-sər How to pronounce tracer (audio)
1
: one that traces, tracks down, or searches out: such 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
2
: one who traces designs, patterns, or markings
3
: a device (such as a stylus) used in tracing
4
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 sense 1d

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