/ Dictionary / Index T tree diagram: Meaning and Definition of Find definitions for: tree' di"agram Pronunciation: [key] a diagram in which lines branch out from a central point or stem without forming any closed loops. Also calledCf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. treed tree ear Related Content Daily Word Quiz: knead Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language