ballonet

noun
bal·​lo·​net | \ ˌba-lə-ˈnā How to pronounce ballonet (audio) \

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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Time Traveler for ballonet

The first known use of ballonet was in 1872

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