Definition of ballonet in English:

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Pronunciation: /ˌbaləˈnā/

Entry from US English dictionary

(also ballonnet)


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.
Example sentences
  • The helicopter is fitted with ballonet flotation devices for emergency landing on water.
  • As a rule, such airships have a soft structure of a ballonet and consequently a considerable drag.
  • This triggers an automatic mechanism that pumps air into the ballonet compartment to compensate.



For editors and proofreaders

Syllabification: bal·lo·net

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