/ Dictionary / Index H hydroairplane: Meaning and Definition of Find definitions for: hy•dro•air•plane Pronunciation: (hī"drō-âr'plān"), [key] — n. a hydroplane. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hydroaerobics hydrobiology Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language