n. [ OF. posterne, posterle, F. poterne, fr. L. posterula, fr. posterus coming after. See Posterior. ]
He by a privy postern took his flight. Spenser. [ 1913 Webster ]
Out at the postern, by the abbey wall. Shak. [ 1913 Webster ]
a. Back; being behind; private. “The postern door.” Dryden. [ 1913 Webster ]