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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 pertaining to lighter-than-air craft.
Origin
1900-1905
1900-05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for lighter than air

lighter than air

adjective (lighter-than-air when prenominal)
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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