ballonet

[bal-uh-ney]
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noun

an air or gasbag compartment in a balloon or airship, used to control buoyancy and maintain shape.

Origin of ballonet

From French, dating back to 1900–05; see origin at balloon, -et
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British Dictionary definitions for ballonet

ballonet

noun

an air or gas compartment in a balloon or nonrigid airship, used to control buoyancy and shape

Word Origin for ballonet

C20: from French ballonnet a little balloon
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012