/ Dictionary / Index B balloonfish: Meaning and Definition of Find definitions for: bal•loon•fish Pronunciation: (bu-ln'fish"), [key] — pl. -fish•es, -fish. a porcupinefish, Diodon holacanthus, inhabiting tropical and subtropical waters. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: balloonfish (Thesaurus) balloon clock balloon frame Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language