from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To reduce the pressure of air or gas within (a chamber or vehicle, for example).
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To reduce the air pressure within a chamber.
- v. To have the pressure of one's environmental atmosphere reduced.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. decrease the pressure of
de- + pressurize (Wiktionary)