/ ˌɑːtʃˈdjuːk; NAmE ˌɑːrtʃˈduːk/ noun
(in the past) a son of the Emperor of Austria :
Archduke Franz Ferdinand
—compare grand duke
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WORD ORIGIN
early 16th cent.: from Old French archeduc , from Latin archidux , archiduc- , from archi- chief + dux , duc- leader; related to ducere to lead.