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auxiliary power unit

noun

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

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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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012