Of or relating to a duke or duchy: a ducal estate. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "ducal" in a sentence
"He called the ducal palace that evening and got through to the chief social secretary."
"Opening this, they entered a room which Casanova immediately identified as the ducal chancellery."
"Gordons_, -- _not_ the _Seyton Gordons_, as she disdainfully termed the ducal branch, -- told me the story, always reminding me how superior _her_"