# grand duke

> English word · Noun

## Definitions
1. Ruler or monarch of a grand duchy.
2. Son, daughter, or grandchild of a czar (emperor) of the Russian Empire. (A more literal translation of the Russian is grand prince.)

## Etymology
From grand + duke, after Middle French and French grand duc /grand-duc, itself after titles in other languages, especially Italian granduca, German Großherzog, and Russian вели́кий князь (velíkij knjazʹ). Doublet of grand-duc.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/grand-duke