/ Dictionary / Index J joint bar: Meaning and Definition of Find definitions for: joint' bar" Pronunciation: [key] one of a pair of bars used to join two rails longitudinally. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. joint and last survivor annuity Joint Chiefs of Staff Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language