postern
Pronunciation:
/ˈpɒst(ə)n//ˈpɑstɚn/noun
Definitions
A back gate, back door, side entrance, or other gateway distinct from the main entrance.
By extension, a separate or hidden way in or out of a place, situation etc.
A subterranean passage communicating between the parade and the main ditch, or between the ditches and the interior of the outworks.
adjective
Definitions
Situated at the rear; posterior.