ca ‧ the ‧ dral /kəˈθiːdrəl/ BrE AmE noun [countable]
[ Date: 1500-1600 ; Origin: cathedral church 'cathedral' (13-21 centuries) ; cathedral from Old French , from Late Latin cathedralis , from Latin cathedra 'chair, bishop's chair' ; ⇨ ↑ chair 1 ]
the main church of a particular area under the control of a ↑ bishop :
St Paul’s Cathedral
cathedral city British English (=one with a cathedral)