/ Dictionary / Index E East River: Meaning and Definition of Find definitions for: East' Riv'er Pronunciation: [key] a strait in SE New York separating Manhattan Island from Long Island and connecting New York Bay and Long Island Sound. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. East Riding East Rockaway Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language