from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Air under greater than atmospheric pressure, especially when used to power a mechanical device or to provide a portable supply of oxygen.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Air which has been reduced in volume and increased in pressure; it is used to power machinery etc
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. air at a pressure greater than that of the atmosphere
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