not rigid.
designating a type of airship having a flexible gas container without a supporting structure and held in shape only by the pressure of the gas within.

1905–10; non- + rigid Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nonrigid (nɒnˈrɪdʒɪd)
1.  not rigid; flexible
2.  (of the gas envelope of an airship) flexible and held in shape only by the internal gas pressure

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Nonrigid airships have no frame and use only gas and envelope design to keep their shape.
The blimps frequently present above large sporting events are usually nonrigid airships.
The first nonrigid airship it acquired was an unusual airship because it was metal-clad.
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