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compressed air

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compressed air

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

Origin:
1660–70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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compressed air  
n.  Air under greater than atmospheric pressure, especially when used to power a mechanical device or to provide a portable supply of oxygen.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: com·pressed air
Pronunciation: k&m-"prest-'a(&)r, käm-, -'e(&)r
Function: noun
: air under pressure greater than that ofthe atmosphere
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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