- a device within the tailpipe of some jet engines for burning extra fuel to produce additional thrust
- an auxiliary device, as on internal-combustion engines and incinerators, for burning undesirable exhaust gases produced during the original combustion
- A device for augmenting the thrust of a jet engine by burning additional fuel with the uncombined oxygen in the exhaust gases.
- A device for burning or chemically altering unburned or partially burned carbon compounds in exhaust gases.
From after- + burner