heavier-than-air ( synonym found)
Definition of heavier-than-air:

(adj) : Weighing more than the volume of air which it displaces; of, pertaining to, or using an aircraft which weighs more than the volume of air it displaces
Definition of heavier-than-air:

(adj) : Weighing more than the volume of air which it displaces; of, pertaining to, or using an aircraft which weighs more than the volume of air it displaces
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