from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An enclosure filled with air for a special purpose.
  • n. A chamber, especially in a hydraulic system, in which air elastically compresses and expands to regulate the flow of a fluid.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a chamber, in a hydraulic system, in which air (or some other gas) is compressed to regulate the flow of a fluid

from the GNU version of the Collaborative International Dictionary of English

  • A chamber or cavity filled with air, in an animal or plant.
  • A cavity containing air to act as a spring for equalizing the flow of a liquid in a pump or other hydraulic machine.
  • n. See Air chamber, in the Vocabulary.


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