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n. pl. tri·fo·ri·a (-fôr′ē-ə) Architecture
An arcaded gallery above the side-aisle arches and below the clerestory of a church.
[Medieval Latin, a gallery in Canterbury Cathedral (later taken to mean "with three openings").]
n, pl -ria (-rɪə)
(Architecture) an arcade above the arches of the nave, choir, or transept of a church
[C18: from Anglo-Latin, apparently from Latin tri- + foris a doorway; referring to the fact that each bay characteristically had three openings]
tri•fo•ri•um(traɪˈfɔr i əm, -ˈfoʊr-)
n., pl. -fo•ri•a (-ˈfɔr i ə, -ˈfoʊr-)
the wall above the arches of the nave or choir of a church and below the clerestory, often having a blind arcade or opening into a gallery.
[1695–1705; < Anglo-Latin; Medieval Latin triforium kind of gallery, literally, something with three openings]