ca·the·dral /kəˈθidrəl/
  大教堂
  Ca·the·dral n.  The principal church in a diocese, so called because in it the bishop has his official chair (Cathedra) or throne.
  Ca·the·dral, a.
  1. Pertaining to the head church of a diocese; as, a cathedral church; cathedral service.
  2. Emanating from the chair of office, as of a pope or bishop; official; authoritative.
     Now, what solemnity can be more required for the pope to make a cathedral determination of an article!   --Jer. Taylor.
  3. Resembling the aisles of a cathedral; as, cathedral walks.
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  cathedral
       adj : relating to or containing or issuing from a bishop's office
             or throne; "a cathedral church"
       n 1: any large and important church
       2: the principal Christian church building of a bishop's
          diocese