grand duke

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noun

the sovereign of a territory called a grand duchy, ranking next below a king.
a son of a czar or of a czar's son.

Origin of grand duke

First recorded in 1685–95

Related forms

grand-du·cal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for grand duke

grand duke

noun

a prince or nobleman who rules a territory, state, or principality
a son or a male descendant in the male line of a Russian tsar
a medieval Russian prince who ruled over other princes

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012