Definition of ballonet in English:

ballonet

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

Entry from US English dictionary

(also ballonnet)

noun

A separate gas- or air-filled compartment within the main envelope of a balloon or airship, designed for the maintenance or adjustment of the envelope’s shape, buoyancy, or orientation.

Origin

French.

Definition of ballonet in:

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Word of the day internecine
Pronunciation: ˌɪntəˈniːsʌɪn
adjective
destructive to both sides in a conflict