We found one dictionary that defines the word grand-duc:

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1. grand-duc: Wiktionary

Definitions from Wiktionary (grand-duc) ▸ noun:  A French grand duke. ▸ Words similar to grand-duc ▸ Usage examples for grand-duc ▸ Idioms related to grand-duc ▸ Wikipedia articles (New!) ▸ Popular adjectives describing grand-duc ▸ Words that often appear near grand-duc ▸ Rhymes of grand-duc ▸ Invented words related to grand-duc