/ Dictionary / Index H heavier-than-air: Meaning and Definition of Find definitions for: heav•i•er-than-air Pronunciation: (hev'ē-ur-un-âr'), [key] — adj. (of an aircraft) weighing more than the air that it displaces, hence having to obtain lift by aerodynamic means. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: heavier-than-air (Thesaurus) heave-off hinge heavily Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language