ballonet

bal·lo·net

[bal-uh-ney]
noun
an air or gasbag compartment in a balloon or airship, used to control buoyancy and maintain shape.

Origin:
1900–05; < French; see balloon, -et

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World English Dictionary
ballonet (ˌbæləˈnɛt) [Click for IPA pronunciation guide]
 
n
an air or gas compartment in a balloon or nonrigid airship, used to control buoyancy and shape
 
[C20: from French ballonnet a little balloon]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Ballonet is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
the offspring of a zebra and a donkey.
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