ballonet
noun
bal·lo·net
ˌba-lə-ˈnā 
: a compartment of variable volume within the interior of a balloon or airship used to control ascent and descent
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“Ballonet.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ballonet. Accessed 22 Dec. 2024.
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