triforium

(-fôr′ē əm)

noun pl. triforia

a gallery or arcade in the wall above the arches of the nave, choir, or transept of a church

Origin: ML < L tri-, tri- + foris, door

See triforium in American Heritage Dictionary 4

noun pl. tri·fo·ri·a (-fôrˈē-ə, -fōrˈ-)
Architecture

A gallery of arches above the side-aisle vaulting in the nave of a church.

Origin:

Origin: Medieval Latin, a gallery in Canterbury Cathedral (later taken to mean “with three openings”)

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