tracer ammunition

[trey-ser]

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, especially at night.
EXPAND
6.
the chemical substance contained in such ammunition.
7.
a substance, especially a radioactive one, traced through a biological, chemical, or physical system in order to study the system.
COLLAPSE

Origin:
1535–45; trace1 + -er1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Tracer ammunition is always a great word to know.
So is doohickey. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a gadget; dingus; thingumbob.
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