postern door

A smaller postern door served the purpose of ordinary entrance; and to that Julian now repaired.

The pass-key rattled in the lock of the postern-door, and Quinton Edge entered the sunken way.

So saying, he turned round and departed through the postern door.

In the palace wall the postern door opened and someone looked out.

Besides the ordinary entrance from outside, the hive had a small postern door opening into the room.