/ Dictionary / Index T TMJ: Meaning and Definition of Find definitions for: TMJ Pronunciation: [key] temporomandibular joint. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. TMI TMJ syndrome Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language