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tracer
[ trey-ser ]
noun
- an inquiry sent from point to point to trace a missing shipment, parcel, or the like, as in a transportation system.
- Also called tracer ammunition. ammunition containing a chemical substance that causes a projectile to trail smoke or fire so as to make its path visible and indicate a target to other firers, especially at night.
- the chemical substance contained in such ammunition.
tracer
/ ˈtreɪsə /
noun
- a person or thing that traces
- a projectile that can be observed when in flight by the burning of chemical substances in its base
- ammunition consisting of such projectiles
- ( as modifier )
tracer fire
- med any radioactive isotope introduced into the body to study metabolic processes, absorption, etc, by following its progress through the body with a gamma camera or other detector
- an investigation to trace missing cargo, mail, etc
tracer
/ trā′sər /
- An identifiable substance, such as a dye or radioactive isotope, that can be followed through the course of a mechanical, chemical, or biological process. Tracers are used in radioimmunoassays and other laboratory testing. The use of radioactive iodine, for example, can give information about thyroid gland metabolism.
- Also called label
Example Sentences
Suddenly, the darkness came alive with muzzle flashes and tracer rounds.
First, however, I was injected with a radioactive tracer that allowed activity in my brain to show up on the scan.
Tracer bullets, each with a descending arc, were zinging all around as Rigg swung LCI(L)-88 to the right.
Below us, on Sultan Ismail Street, government troops thrust lances of tracer fire towards a horde of approaching cadavers.
Three men snapped down behind the tracer-guns, firing without aiming, in a frenzied attempt to catch the fleeing sled.
Firing was incessant from the beginning, and the air seemed blue with tracer smoke.
Here I am, a mechanical engineer, about to tackle the job of a professional detective and tracer of missing persons.
A thin stream of glowing red and orange tracer bullets soared up at the plane from the Catanzas side of the bay.
Every tenth bullet was a tracer that made a white trail in the sky allowing you to track them.
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