from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An enclosure filled with air for a special purpose.
- noun A chamber, especially in a hydraulic system, in which air elastically compresses and expands 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun a chamber, in a
hydraulic system, in which air (or some other gas) is compressedto regulatethe flowof a fluid
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