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

  • n. An airtight chamber, usually located between two regions of unequal pressure, in which air pressure can be regulated.
  • n. A bubble or pocket of air or vapor, as in a pipe, that stops the normal flow of fluid through the conducting part.

from the GNU version of the Collaborative International Dictionary of English

  • n. an intermediate chamber between the outer air and the compressed-air chamber of a pneumatic caisson.

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

  • n. a chamber that provides access to space where air is under pressure


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