Bible Encyclopedias
Quatrefoil
1911 Encyclopedia Britannica
in Gothic architecture, the piercing of tracery in a window or balustrade with small semicircular openings known as "foils"; the intersection of these foils is termed the cusp.
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Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Quatrefoil'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/q/quatrefoil.html. 1910.