apparitor

n. [ L., fr. apparere. See Appear. ] 1. Formerly, an officer who attended magistrates and judges to execute their orders. [ 1913 Webster ]

Before any of his apparitors could execute the sentence, he was himself summoned away by a sterner apparitor to the other world. De Quincey. [ 1913 Webster ]

2. (Law) A messenger or officer who serves the process of an ecclesiastical court. Bouvier. [ 1913 Webster ]