tracer

noun [C]

/ˈtreɪ.sər/

/-sɚ/

Definition

› 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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