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
Sorry, no etymologies found.