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lighter than air

 - 1 dictionary result

light⋅er-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. 2009.
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