Definition of ducal adjective from the Oxford Advanced Learner's Dictionary

 

ducal

 adjective
adjective
BrE BrE//ˈdjuːkl//
 
; NAmE NAmE//ˈduːkl//
 
[only before noun]
 
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of or belonging to a duke the ducal palace in Rouen Word Origin late 15th cent.: from Old French, from duc ‘duke’.
See the Oxford Advanced American Dictionary entry: ducal