/ Dictionary / Index T triforium: Meaning and Definition of Find definitions for: tri•fo•ri•um Pronunciation: (trī-fôr'ē-um, -fōr'-), [key] — pl. -fo•ri•a (in a church) the wall at the side of the nave, choir, or transept, corresponding to the space between the vaulting or ceiling and the roof of an aisle, often having a blind arcade or an opening in a gallery. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trifoliolate triform Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language