Definition of ballonet in English:

ballonet

Syllabification: bal·lo·net
Pronunciation: /ˌbaləˈnā/

Entry from US English dictionary

(also ballonnet)

noun

The compartment in a balloon or airship into which air or another gas can be forced in order to maintain the craft’s shape as buoyant gas is released.

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Word of the day punctum
Pronunciation: ˈpʌŋ(k)təm
noun
a small, distinct point