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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anchorite
a granular metamorphic rock.
a person who has retired to a solitary place for a life of religious seclusion.
a hobble or fetter for a horse or other animal.
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Words nearby auxiliary power unit

auxiliaries, auxiliary, auxiliary equation, auxiliary language, auxiliary note, auxiliary power unit, auxiliary rafter, auxiliary rotor, auxiliary storage, auxiliary tone, 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