/ Dictionary / Index P Pearl River: Meaning and Definition of Find definitions for: Pearl' Riv'er Pronunciation: [key] a river flowing from central Mississippi into the Gulf of Mexico. 485 mi. (780 km) long. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pearl perch Pearlstein Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language