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1. (n.) tracer
a person or thing that traces.
2. tracer
a person whose business or work is the tracing of missing property, parcels, persons, etc.
3. tracer
an inquiry sent from point to point to trace a missing shipment, parcel, or the like.
4. tracer
a projectile, as a bullet, containing a chemical substance that leaves a trail of fire or smoke.
5. tracer
a substance, esp. a radioactive one, traced through a biological, chemical, or physical system in order to study the system.
Etymology: (1535–45)
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| Definition of 'tracer' |
Princeton's WordNet |
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1. (noun) tracer
an investigator who is employed to find missing persons or missing goods
2. (noun) tracer
an instrument used to make tracings
3. (noun) tracer
(radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes
4. (noun) tracer, tracer bullet
ammunition whose flight can be observed by a trail of smoke
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| Definition of 'tracer' |
Webster Dictionary |
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1. (noun) tracer
one who, or that which, traces
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Definitions of tracer 
