Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
A rope hung from a balloon or dirigible so as trail along theground for about half its length, used to preserve altitudeautomatically, by variation of the length dragging on the ground,without loss of ballast or gas.
Share your knowledge with the community
Browse our collection of 300,000+ community-written definitions
