heavier-than-air

[hev-ee-er-thuhn-air]
adjective
(of an aircraft) weighing more than the air that it displaces, hence having to obtain lift by aerodynamic means.

Origin:
1900–05

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
heavier-than-air
 
adj
1.  having a density greater than that of air
2.  of or relating to an aircraft that does not depend on buoyancy for support but gains lift from aerodynamic forces

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
He established the scientific principles for heavier-than-air flight and used glider models for his research.
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