ducal signifie anglais

ducal▼◼◼◼(relating to a duke or duchess)
adjective
[UK: ˈdjuːk.l̩] [US: ˈduːk.l̩]

archducal▼◼◼◼(pertaining to archdukes)
adjective
[UK: ˌɑːtʃdjˈuːkəl] [US: ˌɑːrtʃdˈuːkəl]