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lighter-than-air

[lahy-ter-th uh n-air] /ˈlaɪ tər ðənˈɛər/
adjective, Aeronautics
1.
(of an aircraft) weighing less than the air it displaces, hence obtaining lift from aerostatic buoyancy.
2.
of or relating to lighter-than-air craft.
Origin of lighter-than-air
1900-1905
1900-05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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