Postern
POSTERN (from O. Fr. posterne, posterle, Late Lat. posterula, small back-door, posterns, behind), a small gateway in the enceinte of a castle, abbey, etc., from which to issue and enter unobserved. They are often called "sally ports." (See GATE.)
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)
