Definitions

1. adjective

relating to or resembling a triforium, especially in architecture, particularly having three openings or columns, one above the other, usually in a church or cathedral.

“The triforial architecture of the cathedral was a sight to behold.”

2. noun

a triforium, especially in architecture, particularly having three openings or columns, one above the other, usually in a church or cathedral.

“The triforial structure supported the weight of the heavy stone above it.”