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Meaning of triforium

tri•fo•ri•um

Pronunciation: (trī-fôr'ē-um, -fōr'-), [key]
— pl. -fo•ri•a
  1. (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.