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English definition of “tracer”

tracer

noun [C]     /ˈtreɪ.sər/ US  /-sɚ/
a bullet that leaves a line of flame or smoke behind it when it is fired , so that you can see the direction it has taken: Tracer bullets streaked through the sky . The sky was bright with tracer fire .Bullets and cartridges
(Definition of tracer noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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