/ Dictionary / Index N Northbrook: Meaning and Definition of Find definitions for: North•brook Pronunciation: (nôrth'brook"), [key] — n. a city in NE Illinois. 30,735. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Northbridge north by east Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language