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1
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
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
Example Sentences
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 Ideally, those conversations would happen within 24 hours of the test result, so arrangements could be made for the person to isolate and so a contact tracer can alert those who were around them. 
Washington Post, 18 Sep. 2021 My goal is at least 20 people with an AR-15 and some tracer rounds. Terry Spencer, BostonGlobe.com, 18 July 2022 My goal is at least 20 people with an AR-15 and some tracer rounds. Emily Shapiro, ABC News, 18 July 2022 My goal is at least 20 people with an AR-15 and some tracer rounds. CBS News, 18 July 2022 My goal is at least 20 people with an AR-15 and some tracer rounds. Terry Spencer, Anchorage Daily News, 18 July 2022 But before a contact tracer could call, parents would learn from the testing company that their children’s PCR tests, typically the gold standard of COVID-19 testing, were negative, even for students with symptoms. Anjeanette Damon, ProPublica, 20 May 2022 No use of any kind of fireworks, steel tipped/core ammunition, tracer ammunition or other pyrotechnic devices, including exploding targets. Scott D. Pierce, The Salt Lake Tribune, 2 June 2022 Job description: Prepare, administer, and measure radioactive isotopes in therapeutic, diagnostic, and tracer studies using a variety of radioisotope equipment. Zachary Smith, cleveland, 29 Mar. 2022 See More
Washington Post, 18 Sep. 2021 My goal is at least 20 people with an AR-15 and some tracer rounds. Terry Spencer, BostonGlobe.com, 18 July 2022 My goal is at least 20 people with an AR-15 and some tracer rounds. Emily Shapiro, ABC News, 18 July 2022 My goal is at least 20 people with an AR-15 and some tracer rounds. CBS News, 18 July 2022 My goal is at least 20 people with an AR-15 and some tracer rounds. Terry Spencer, Anchorage Daily News, 18 July 2022 But before a contact tracer could call, parents would learn from the testing company that their children’s PCR tests, typically the gold standard of COVID-19 testing, were negative, even for students with symptoms. Anjeanette Damon, ProPublica, 20 May 2022 No use of any kind of fireworks, steel tipped/core ammunition, tracer ammunition or other pyrotechnic devices, including exploding targets. Scott D. Pierce, The Salt Lake Tribune, 2 June 2022 Job description: Prepare, administer, and measure radioactive isotopes in therapeutic, diagnostic, and tracer studies using a variety of radioisotope equipment. Zachary Smith, cleveland, 29 Mar. 2022 See More Word History
First Known Use
14th century, in the meaning defined at sense 1
Time Traveler
The first known use of tracer was in the 14th century 👨🏻🏫 Mr. Ng 韋氏詞典 📚 – mw.mister5️⃣.net
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