Archduke \Arch`duke"\, n. [Pref. arch- + duke.]
A prince of the imperial family of Austria.
[1913 Webster]
Note: Formerly this title was assumed by the rulers of
Lorraine, Brabant, Austria, etc. It is now appropriated
to the descendants of the imperial family of Austria
through the make line, all such male descendants being
styled archduke, and all such female descendants
archduchesses.
[1913 Webster]