- 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).