Bible Encyclopedias
Postern
1911 Encyclopedia Britannica
(from 0. Fr. posterne, posterle, Late Lat. posterula, small back-door, posterns, behind), a small gateway in the enceinte of a castle, abbey, &c., from which to issue and enter unobserved. They are often called "sally ports." (See GATE.)
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Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Postern'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/p/postern.html. 1910.