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Tracer (Noun)

Ammunition whose flight can be observed by a trail of smoke.

Nouns denoting man-made objects.

The military used tracer rounds to track the trajectory of their bullets in low-light conditions.
Tracer ammunition helped the pilots to aim accurately at their targets during the nighttime mission.
The rifle squad fired tracer rounds to mark the location of the enemy bunker for an airstrike.
The sniper's use of tracer bullets revealed his position to the enemy, forcing him to relocate quickly.
Machine gunners relied on tracers to adjust their aim and hit moving targets more effectively.

An instrument used to make tracings.

Nouns denoting man-made objects.

The artist held the pencil tracer tightly in her hand as she drew a precise outline of the intricate design.
She positioned the tracer at the right angle on the model, carefully recording the measurements for the project.
A pantograph tracer was necessary to ensure accurate scaling when transferring the image.
The architects used a tracing machine with a mounted tracer that consisted of a ballpoint pen on a swiveling arm.
By using a flexible-curve tracer the engineer was able to easily record the irregular shape of the pipe.

An investigator who is employed to find missing persons or missing goods.

Nouns denoting people.

The experienced private tracer was known for her ability to locate even the most elusive missing persons.
After years of no leads, the desperate family hired a professional tracer to find their missing daughter.
As a skilled tracer, she was able to track down the stolen goods and recover them for the insurance company.
Following a careful investigation, the tracer discovered the identity of the missing goods' thief and notified the authorities.
With advanced research and surveillance techniques, the tracer was finally able to pinpoint the location of the missing person.

(radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes.

Nouns denoting man-made objects.

Technetium-99m is commonly used as a tracer in nuclear medicine to diagnose various diseases, such as cancer and bone disorders.
The patient received a small injection of a radioactive tracer before undergoing a positron emission tomography scan.
Researchers used carbon-14 as a tracer to study the metabolism of glucose in the body.
After administering the tracer, the doctor monitored the patient's progress using a series of PET scans.
Gallium-67 citrate is sometimes used as a tracer to detect and monitor certain types of infections or tumors.