grand duke

1. 1.

   a prince who rules a territory

   Broaderprince

   NarrowerIvan III

Questions about grand duke

What does grand duke mean?

grand duke means "a prince who rules a territory".

Is grand duke a common word?

grand duke is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.