afterburner

[ af-ter-bur-ner, ahf- ]
/ ˈæf tərˌbɜr nər, ˈɑf- /

noun

Aeronautics. a device placed within, or attached to the exit of, a jet-engine exhaust pipe to produce afterburning.
a device for burning exhaust fumes from an internal-combustion engine, as of an automobile.

Origin of afterburner

First recorded in 1945–50; after + burner

British Dictionary definitions for afterburner

afterburner
/ (ˈɑːftəˌbɜːnə) /

noun

a device in the exhaust system of an internal-combustion engine for removing or rendering harmless potentially dangerous components in the exhaust gases
a system of fuel injection and combustion located behind the turbine of an aircraft jet engine to produce additional thrust