/ Dictionary / Index S South River: Meaning and Definition of Find definitions for: South' Riv'er Pronunciation: [key] a borough in central New Jersey. 14,361. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. South Portland southron Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language