BIFORA. — This is the name given to any window with two adjoining openings, generally divided by a small column and enclosed within a single architectural frame, arched or otherwise. It is already found as a decorative element on the façades of Lombard churches of the 12th century (Pavia, S. Michele), and in other Umbrian and Apulian churches of the same period. It enjoyed greater popularity in the Gothic period and the early Renaissance, assuming highly diverse formal varieties according to locality, culminating in the characteristic examples at the Certosa di Pavia, where the dividing column is replaced by a candelabrum.
BIFORA
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“BIFORA.” Enciclopedia Cattolica, vol. II (1949), p. 941. Azione Romana digital edition, https://azioneromana.com/article/bifora.