This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of or relating to a duke or duchy: a ducal estate.

adj. Of or pertaining to a duke, a duchess, or the duchy or dukedom they hold.

adj. Of or pertaining to a duke.

Pertaining to a duke: as, a ducal coronet.

In ornithology, a term applied to certain large terns of the subgenus Thalasseus, as Sterna(Thalasseus) cantiaca.

adj. of or belonging to or suitable for a duke

"He called the ducal palace that evening and got through to the chief social secretary."

nobility    royal    noble    baronial    regal   

duchess    duchy    duke   

buccal   

imperial    papal    princely    baronial    episcopal    pontifical    triumphal    rightful    starry    sumptuous