noun, plural tri·fo·ri·a [trahy-fawr-ee-uh, -fohr-] /traɪˈfɔr i ə, -ˈfoʊr-/. Architecture.
Origin of triforium
Related formstri·fo·ri·al, adjective
Examples from the Web for triforium
The Triforium is unusually fine, and now extends over the north and south choir aisles, but not over the east end.
It will also be noticed that the outer arches of the triforium are not concentric with the sub-arches.Bell's Cathedrals: The Cathedral Church of Norwich|C. H. B. Quennell
These windows rise as high as the top of those of the triforium.The Cathedral Church of Peterborough|W.D. Sweeting
The main arches and triforium are Norman, the clerestory and vaulting Early English (circa 1250).
Above is the triforium, consisting of two arches, each divided into three sub-arches.