Etymograph

English

grand duke

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).

A compound of grand + duke

Latin grandis ‘full-grown, great’

Old French grant ‘big, large’

Anglo-Norman graunt

Middle English grand

English grand

Proto-Indo-European *dewk- ‘to pull’

…

Latin dūcō ‘to lead’

Latin dux ‘leader’

Old French duc ‘duke’

Middle English duk ‘duke’

English duke

Today it means

noun Ruler or monarch of a grand duchy.

Language periods are conventional ranges, not dates for this word.

Etymograph / grand duke

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