1
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
Examples of tracer in a Sentence
The enemy fired tracers at the aircraft carrier.
They injected her with a radioactive tracer and tracked it via X-rays.
Recent Examples on the Web
This tracer can only be identified by Birla’s advanced laboratories in India and China, effectively eliminating the possibility of counterfeit certifications.
—
Sj Studio, Sourcing Journal, 4 Nov. 2024
Other posts recommend alternating buckshot rounds with normal bullets to clear the bore of plastic residue from the sleeve which may otherwise clog up the barrel, or alternating with tracer rounds to improve aiming.
—David Hambling, Forbes, 10 Dec. 2024
Notably, the tracer remains detectable in the final product even after multiple washes, ensuring a long-lasting solution for consumers and reinforcing trust in home textiles made with Birla Excel.
—Sj Studio, Sourcing Journal, 4 Nov. 2024
New York City aims to hire 2,500 new employees as tracers; the state of Michigan instead plans to rely largely on volunteers.
—Jeremy Konyndyk, Foreign Affairs, 8 June 2020
See all Example Sentences for tracer 
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Sj Studio, Sourcing Journal, 4 Nov. 2024
Other posts recommend alternating buckshot rounds with normal bullets to clear the bore of plastic residue from the sleeve which may otherwise clog up the barrel, or alternating with tracer rounds to improve aiming.
—David Hambling, Forbes, 10 Dec. 2024
Notably, the tracer remains detectable in the final product even after multiple washes, ensuring a long-lasting solution for consumers and reinforcing trust in home textiles made with Birla Excel.
—Sj Studio, Sourcing Journal, 4 Nov. 2024
New York City aims to hire 2,500 new employees as tracers; the state of Michigan instead plans to rely largely on volunteers.
—Jeremy Konyndyk, Foreign Affairs, 8 June 2020
See all Example Sentences for tracer
Dictionary Entries Near tracer
Cite this Entry
“Tracer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tracer. Accessed 18 Jan. 2025.
Copy CitationKids Definition
tracer
noun
trac·er
ˈtrā-sər 
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
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