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Definition of Heavier-than-air
1. Adjective. Relating to an aircraft heavier than the air it displaces.
Definition of Heavier-than-air
1. Adjective. (context: of an aircraft) Weighing more than the volume of air which it displaces. ¹
2. Adjective. Of, pertaining to, or using an aircraft which weighs more than the volume of air it displaces. ¹
¹ Source: wiktionary.com