lighter than air

lighter-than-air

[lahy-ter-thuhn-air]
adjective Aeronautics.
1.
(of an aircraft) weighing less than the air it displaces, hence obtaining lift from aerostatic buoyancy.
2.
of or pertaining to lighter-than-air craft.

Origin:
1900–05

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lighter than air
 
adj
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

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