- 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.
Origin of nonrigid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- not rigid; flexible
- (of the gas envelope of an airship) flexible and held in shape only by the internal gas pressure