after burner

afterburner

[af-ter-bur-ner, ahf-]
noun
1.
Aeronautics. a device placed within, or attached to the exit of, a jet-engine exhaust pipe to produce afterburning.
2.
a device for burning exhaust fumes from an internal-combustion engine, as of an automobile.

Origin:
1945–50; after + burner

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World English Dictionary
afterburner (ˈɑːftəˌbɜːnə)
 
n
1.  a device in the exhaust system of an internal-combustion engine for removing or rendering harmless potentially dangerous components in the exhaust gases
2.  a system of fuel injection and combustion located behind the turbine of an aircraft jet engine to produce additional thrust

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