/ Dictionary / Index P Pontchartrain: Meaning and Definition of Find definitions for: Pont•char•train Pronunciation: (pon'chur-trān"), [key] a shallow extension of the Gulf of Mexico in SE Louisiana, N of New Orleans. 41 mi. (66 km) long; 25 mi. (40 km) wide. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Ponta Grossa Pontefract Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language