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air engine

noun
1.
an engine that uses the expansion of heated air to drive a piston
2.
a small engine that uses compressed air to drive a piston
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
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Examples from the Web for air engine
Historical Examples
  • The air engine would in many respects possess advantages over the steam engine, if it could be worked economically.

    Great Facts Frederick C. Bakewell

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