nonrigid

• non-rigid

non- +‎ rigid

nonrigid (not comparable)

1. Not rigid; flexible.
2. (of an airship) That maintains its shape only by internal gas pressure.

• nonrigidity

The airship Spirit of Goodyear, a nonrigid

nonrigid (plural nonrigids)

1. (aviation) An airship that maintains its shape only by internal gas pressure.

   Nonrigids are cheap and easy to build, store, and transport, but their lack of structural reinforcement limits them to smaller sizes and lower speeds than rigids or semirigids.

• blimp

• airship
• dirigible

• rigid
• semirigid

• dirigible is not a synonym, but a hypernym; it refers to all steerable self-propelled airships, whether rigid, semirigid, or nonrigid.

• Girondin