/ Dictionary / Index M Middle River: Meaning and Definition of Find definitions for: Mid'dle Riv'er Pronunciation: [key] a city in N Maryland: suburb of Baltimore. 26,756. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. middle plane Middlesborough Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language