Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • transitive verb To reduce the pressure of air or gas within (a chamber or vehicle, for example).

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • verb transitive To reduce the air pressure within a chamber.
  • verb intransitive To have the pressure of one's environmental atmosphere reduced.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • verb decrease the pressure of

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

de- +‎ pressurize

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