auxiliary power unit

noun

an additional engine fitted to an aircraft to operate when the main engines are not in use

Nearby words

  1. auxiliaries,
  2. auxiliary,
  3. auxiliary equation,
  4. auxiliary language,
  5. auxiliary note,
  6. auxiliary rafter,
  7. auxiliary rotor,
  8. auxiliary storage,
  9. auxiliary tone,
  10. auxiliary verb

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