POSTERN

postern. Postern, n. a small back gate, a little door

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Pos″tern (?), n. [[OF. posterne, posterle, F. poterne, fr. L. posterula, fr. posterus coming after. See Posterior.]] 1. 1. Originally, a back door or gate; a private entrance; hence, any small door or gate.
He by a privy postern took his flight. Spenser. Out at the postern, by the abbey wall. Shak. 2. 2. (Fort.) A subterraneous passage communicating between the parade and the main ditch, or between the ditches and the interior of the outworks. Mahan.