/ Dictionary / Index P pontoon bridge: Meaning and Definition of Find definitions for: pon'toon bridge" Pronunciation: [key] a bridge supported by pontoons. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pontoon Pontoppidan Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language