/ Dictionary / Index J joint runner: Meaning and Definition of Find definitions for: joint' run"ner Pronunciation: [key] (in plumbing) incombustible materials for packing a joint to be caulked with lead. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. joint return joint session Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language