/ Dictionary / Index P Pontoise: Meaning and Definition of Find definitions for: Pon•toise Pronunciation: (pôn-twaz'), [key] — n. a city in and the capital of Val-d'Oise, in N France, on the Oise River, NW of Paris. 28,241. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Pontocaine pontonier 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