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Tracer   /trˈeɪsər/   Listen
Tracer

noun
1.
An investigator who is employed to find missing persons or missing goods.
2.
An instrument used to make tracings.
3.
(radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes.
4.
Ammunition whose flight can be observed by a trail of smoke.  Synonym: tracer bullet.



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"Tracer" Quotes from Famous Books



... birds come over disguised as clouds and spit mouthfuls of red-hot tracer-bullets at it, and then the observers hop out. One of them "hopped out" into my horse-lines last week. That is to say his parachute caught in a tree and he hung swinging, like a giant pendulum, ...
— Punch, or the London Charivari, Vol. 153, October 31, 1917 • Various
... of any of the other ships, mere flight promised little. The other ships, too, were armed, at any rate the leader was, and Bell had only small arms at his disposal. But a plane pilot, stunting madly to dodge tracer bullets, has little time to ...
— Astounding Stories of Super-Science, June, 1930 • Various
... question. The last order received from your firm was for a pair of flat cylindrical lenses to match broken sample you enclosed. This was taken care of the same day as received and sent on to you, properly addressed. We would suggest that you enter tracer with the postoffice department in ...
— The So-called Human Race • Bert Leston Taylor


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