grand duke

noun
🔊/ˌɡrænd ˈdjuːk/
🔊/ˌɡrænd ˈduːk/
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  1. (in some parts of Europe, especially in the past) a male leader of a small independent state(尤指旧时欧洲某些地方的)大公
    • The Grand Duke of Tuscany托斯卡纳大公
  2. (in Russia in the past) a son of the tsar(旧时俄国的)王子 compare archduke