trefoil arch

noun

, Architecture.

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A "trefoil arch" connects the 113six chief pillars, on each of which stands a statue of a Virtue.

Isabel has a polygonal apse, with each side arcaded with a Moorish trefoil arch.

Its inner trefoil arch is of a form very uncommon in this country, but more usual on the Continent.

The arch over it is a moulded trefoil arch, surmounted by a plain canopy of very simple and formal design.

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