tracer
1 ENTRIES FOUND:
plural
tracers
plural
tracers
Britannica Dictionary definition of TRACER
[count]
1
:
a type of bullet that shows its path by creating smoke or light as it moves through the air
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The enemy fired tracers at the aircraft carrier.
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tracer fire/rounds/bullets
2
medical
:
a substance that is put in a patient's body so that doctors can watch a biological process (such as digestion) or see how a condition (such as cancer) is progressing
-
They injected her with a radioactive tracer and tracked it via X-rays.
