a sovereign prince, esp. a prince of the former Austrian imperial family
- In certain royal families, especially that of imperial Austria, a nobleman having a rank equivalent to that of a sovereign prince.
- Used as a title for such a nobleman.
Origin of archdukeObsolete French archeduc : arche-, arch- (from Old French; see arch–1) + duc, duke (from Old French; see duke).
- The son or male-line grandson of an emperor of the Austro-Hungarian Empire.
- World War I traditionally started with the assassination of Archduke Francis (Franz) Ferdinand.
From Middle French, from Old French archeduc (modern: archiduc).