ballonet

noun
bal·lo·net | \ˌba-lə-ˈnā \

Definition of ballonet 

: a compartment of variable volume within the interior of a balloon or airship used to control ascent and descent

First Known Use of ballonet

1872, in the meaning defined above

History and Etymology for ballonet

French ballonnet, diminutive of ballon

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The first known use of ballonet was in 1872

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