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A Multifoil arch is a style of arch that was an architectural element in the Moorish architecture of al-Andalus.
The multifoil arch design was influenced by Islamic art and architecture. Examples are found in the Moorish Umayyad Caliphate mosque maqsuras and arcades, that are located in present-day Spain.
The term is French, "foil" means "leaf." The number of foils involved is indicated by a prefix: trefoil —3, quatrefoil —4, etc., and multifoil —many.
References
Multifoil arch Wikipedia(Text) CC BY-SA