grand duke

noun

1. the sovereign of a territory called a grand duchy, ranking next below a king.

2. a son of a czar or of a czar's son.

grand duke

noun

1. a prince or nobleman who rules a territory, state, or principality

2. a son or a male descendant in the male line of a Russian tsar

3. a medieval Russian prince who ruled over other princes

Other Word Forms

• grand-ducal adjective

Word History and Origins

Origin of grand duke¹

First recorded in 1685–95