lighter than air


adjective Aeronautics.
(of an aircraft) weighing less than the air it displaces, hence obtaining lift from aerostatic buoyancy.
of or pertaining to lighter-than-air craft.

1900–05 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lighter than air
1.  having a lower density than that of air
2.  of or relating to an aircraft, such as a balloon or airship, that depends on buoyancy for support in the air

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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