From a derivative of prasso; a practiser, i.e. (specially), an official collector -- officer.
see GREEK prasso
1. one who does anything, a doer (Sophocles).
2. "one who does the work of inflicting punishment or taking vengeance; especially the avenger of a murder (Aeschylus, Sophocles); the exactor of a pecuniary fine" ((Antiphon), Demosthenes, others); an officer of justice of the tower order whose business it is to inflict punishment: Luke 12:58.