Grand Duke Definition

noun
The sovereign ruler of a grand duchy, ranking just below a king.
Webster's New World
In czarist Russia, a prince of the royal family.
Webster's New World
A son or grandson of a czar in the male line.
American Heritage
Used as the title for such a nobleman.
American Heritage

Other Word Forms of Grand Duke

Noun

Singular:
grand duke
Plural:
grand-dukes

Origin of Grand Duke

  • Old French grant duc, from Latin grandis + dux, from the verb duco (“to lead”).

    From Wiktionary

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