Definition of grand duke noun from the Oxford Advanced Learner's Dictionary

     

    grand duke

     noun
    noun
    BrE
     
    ; NAmE
     
     
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  1. 1(in some parts of Europe, especially in the past), a male ruler of a small independent state The Grand Duke of Tuscany
  2. 2(in Russia in the past), a son of the tsar compare archduke

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