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tracer
1 dictionary results for: tracer ammunition
Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

trac⋅er

[trey-ser]
–noun
1. a person or thing that traces.
2. a person whose business or work is the tracing of missing property, parcels, persons, etc.
3. an inquiry sent from point to point to trace a missing shipment, parcel, or the like, as in a transportation system.
4. any of various devices for tracing drawings, plans, etc.
5. 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, esp. at night.
6. the chemical substance contained in such ammunition.
7. a substance, esp. a radioactive one, traced through a biological, chemical, or physical system in order to study the system.

Origin:
1535–45; trace 1 + -er 1
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