What is Arches Court?

Legal Definition
The Arches Court, presided over by the Dean of Arches, is an ecclesiastical court of the Church of England covering the Province of Canterbury. Its equivalent in the Province of York is the Chancery Court.
-- Wikipedia
Legal Definition
In English ecolesiastical law. A court of appeal bslonging to the Archbishop of Canterbury, the judge of which is called the "Dean of the Arches," 'because his court was anciently held in the church of Saint Mary-le-Bow, (Sancta Maria de Arcubus,) so named from the steeple, which is raised upon pillars built archwise The court was until recently held in the hall belonging to the College of Civilians, commonly called "Doctors' Commons." It is now held in Westminster Hall. Its proper jurisdiction is only over the thirteen peculiar parishes belonging to the archbishop in London, but, the office of Dean of the Arches having been for a long time united with that of the archbishop's principal official, the Judge of the Arches, in right of such added office, it receives and determines appeals from the sentences of all interior ecolesiastical courts within the province. 3 Bl. Comm. 64.
-- Black's Law Dictionary
Legal Definition
The name of one of the English ecclesiastical courts. Vide Court of Arches.
-- Bouviers Law Dictionary
Legal Definition
An ecclesiastical court of appeal and of original jurisdiction.
-- Ballentine's Law Dictionary