Also found in: Thesaurus, Encyclopedia.
1. In certain royal families, especially that of imperial Austria, a nobleman having a rank equivalent to that of a sovereign prince.
2. Used as a title for such a nobleman.
[Obsolete French archeduc : arche-, arch- (from Old French; see arch-1) + duc, duke (from Old French; see duke).]
the territory ruled by an archduke or archduchessthe position or rank of an archduke