afterburner

(-bʉrn′ər)

noun

  1. a device within the tailpipe of some jet engines for burning extra fuel to produce additional thrust
  2. an auxiliary device, as on internal-combustion engines and incinerators, for burning undesirable exhaust gases produced during the original combustion

See afterburner in American Heritage Dictionary 4

noun
  1. A device for augmenting the thrust of a jet engine by burning additional fuel with the uncombined oxygen in the exhaust gases.
  2. A device for burning or chemically altering unburned or partially burned carbon compounds in exhaust gases.

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