compressed air

noun
air compressed, especially by mechanical means, to a pressure higher than the surrounding atmospheric pressure.

Origin:
1660–70

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World English Dictionary
compressed air
 
n
air at a higher pressure than atmospheric pressure: used esp as a source of power for machines

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Others have tried to inject compressed air into the stream.
Thin air is not nearly as rich in oxygen as the dense, more heavily compressed
  air found at sea level.
Apart from a hydraulic lift and a plentiful supply of compressed air, your
  correspondent's humble workshop has nothing to compare.
Compressed air he's not so enthusiastic about in this scenario.
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