heavier-than-air

US:USA pronunciation: respellingUSA pronunciation: respelling(hevē ər ᵺən âr)



WordReference Random House Unabridged Dictionary of American English © 2020
heav•i•er-than-air  (hevē ər ᵺən âr),USA pronunciation adj. 
  1. Aeronautics(of an aircraft) weighing more than the air that it displaces, hence having to obtain lift by aerodynamic means.
  • 1900–05

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