/ Dictionary / Index B blackboard jungle: Meaning and Definition of Find definitions for: black'board jun'gle Pronunciation: [key] — Informal. Informal. a school or school system characterized by lack of discipline and by juvenile delinquency. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. blackboard blackbody Related Content Daily Word Quiz: blanch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language